| Message ID | 20241009234610.27039-11-yichen.wang@bytedance.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Use Intel DSA accelerator to offload zero page checking in multifd live migration. | expand |
Yichen Wang <yichen.wang@bytedance.com> writes: > From: Hao Xiang <hao.xiang@linux.dev> > > During live migration, if the latency between sender and receiver is > high and bandwidth is also high (a long and fat pipe), using a bigger > packet size can help reduce migration total time. The current multifd > packet size is 128 * 4kb. In addition, Intel DSA offloading performs > better with a large batch task. > > This change adds an option to set the packet size, which is also useful > for performance tuning. Both sender and receiver needs to set the same > packet size for things to work. > > Set the option: > migrate_set_parameter multifd-packet-size 4190208 > > Signed-off-by: Hao Xiang <hao.xiang@linux.dev> > Signed-off-by: Yichen Wang <yichen.wang@bytedance.com> Looks good to me. However, could you do a migration-test pass setting the maximum value for all the tests to see if anything breaks? > --- > migration/migration-hmp-cmds.c | 7 ++++++ > migration/multifd-zlib.c | 6 ++++-- > migration/multifd-zstd.c | 6 ++++-- > migration/options.c | 39 ++++++++++++++++++++++++++++++++++ > migration/options.h | 1 + > qapi/migration.json | 21 +++++++++++++++--- > 6 files changed, 73 insertions(+), 7 deletions(-) > > diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c > index 983f13b73c..561ed45250 100644 > --- a/migration/migration-hmp-cmds.c > +++ b/migration/migration-hmp-cmds.c > @@ -292,6 +292,9 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict) > monitor_printf(mon, "%s: %u ms\n", > MigrationParameter_str(MIGRATION_PARAMETER_X_CHECKPOINT_DELAY), > params->x_checkpoint_delay); > + monitor_printf(mon, "%s: %" PRIu64 "\n", > + MigrationParameter_str(MIGRATION_PARAMETER_MULTIFD_PACKET_SIZE), > + params->multifd_packet_size); > monitor_printf(mon, "%s: %u\n", > MigrationParameter_str(MIGRATION_PARAMETER_MULTIFD_CHANNELS), > params->multifd_channels); > @@ -580,6 +583,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict) > QAPI_LIST_APPEND(tail, strv[i]); > } > break; > + case MIGRATION_PARAMETER_MULTIFD_PACKET_SIZE: > + p->has_multifd_packet_size = true; > + visit_type_size(v, param, &p->multifd_packet_size, &err); > + break; > case MIGRATION_PARAMETER_MULTIFD_CHANNELS: > p->has_multifd_channels = true; > visit_type_uint8(v, param, &p->multifd_channels, &err); > diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c > index 8cf8a26bb4..58c278533a 100644 > --- a/migration/multifd-zlib.c > +++ b/migration/multifd-zlib.c > @@ -39,6 +39,7 @@ static int multifd_zlib_send_setup(MultiFDSendParams *p, Error **errp) > struct zlib_data *z = g_new0(struct zlib_data, 1); > z_stream *zs = &z->zs; > const char *err_msg; > + uint64_t multifd_packet_size = migrate_multifd_packet_size(); > > zs->zalloc = Z_NULL; > zs->zfree = Z_NULL; > @@ -48,7 +49,7 @@ static int multifd_zlib_send_setup(MultiFDSendParams *p, Error **errp) > goto err_free_z; > } > /* This is the maximum size of the compressed buffer */ > - z->zbuff_len = compressBound(MULTIFD_PACKET_SIZE); > + z->zbuff_len = compressBound(multifd_packet_size); > z->zbuff = g_try_malloc(z->zbuff_len); > if (!z->zbuff) { > err_msg = "out of memory for zbuff"; > @@ -162,6 +163,7 @@ out: > > static int multifd_zlib_recv_setup(MultiFDRecvParams *p, Error **errp) > { > + uint64_t multifd_packet_size = migrate_multifd_packet_size(); > struct zlib_data *z = g_new0(struct zlib_data, 1); > z_stream *zs = &z->zs; > > @@ -176,7 +178,7 @@ static int multifd_zlib_recv_setup(MultiFDRecvParams *p, Error **errp) > return -1; > } > /* To be safe, we reserve twice the size of the packet */ > - z->zbuff_len = MULTIFD_PACKET_SIZE * 2; > + z->zbuff_len = multifd_packet_size * 2; > z->zbuff = g_try_malloc(z->zbuff_len); > if (!z->zbuff) { > inflateEnd(zs); > diff --git a/migration/multifd-zstd.c b/migration/multifd-zstd.c > index abed140855..1f97a5417c 100644 > --- a/migration/multifd-zstd.c > +++ b/migration/multifd-zstd.c > @@ -39,6 +39,7 @@ struct zstd_data { > > static int multifd_zstd_send_setup(MultiFDSendParams *p, Error **errp) > { > + uint64_t multifd_packet_size = migrate_multifd_packet_size(); > struct zstd_data *z = g_new0(struct zstd_data, 1); > int res; > > @@ -58,7 +59,7 @@ static int multifd_zstd_send_setup(MultiFDSendParams *p, Error **errp) > return -1; > } > /* This is the maximum size of the compressed buffer */ > - z->zbuff_len = ZSTD_compressBound(MULTIFD_PACKET_SIZE); > + z->zbuff_len = ZSTD_compressBound(multifd_packet_size); > z->zbuff = g_try_malloc(z->zbuff_len); > if (!z->zbuff) { > ZSTD_freeCStream(z->zcs); > @@ -149,6 +150,7 @@ out: > > static int multifd_zstd_recv_setup(MultiFDRecvParams *p, Error **errp) > { > + uint64_t multifd_packet_size = migrate_multifd_packet_size(); > struct zstd_data *z = g_new0(struct zstd_data, 1); > int ret; > > @@ -170,7 +172,7 @@ static int multifd_zstd_recv_setup(MultiFDRecvParams *p, Error **errp) > } > > /* To be safe, we reserve twice the size of the packet */ > - z->zbuff_len = MULTIFD_PACKET_SIZE * 2; > + z->zbuff_len = multifd_packet_size * 2; > z->zbuff = g_try_malloc(z->zbuff_len); > if (!z->zbuff) { > ZSTD_freeDStream(z->zds); > diff --git a/migration/options.c b/migration/options.c > index a0b3a7d291..b1eaf1c095 100644 > --- a/migration/options.c > +++ b/migration/options.c > @@ -80,6 +80,13 @@ > #define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS 5 > #define DEFAULT_MIGRATE_ANNOUNCE_STEP 100 > > +/* > + * Parameter for multifd packet size. > + */ > +#define DEFAULT_MIGRATE_MULTIFD_PACKET_SIZE (128 * 4 * 1024) > +/* DSA device supports up to 1024 batches, i.e. 1024 * 4K pages */ > +#define MAX_MIGRATE_MULTIFD_PACKET_SIZE (1024 * 4 * 1024) > + > #define DEFINE_PROP_MIG_CAP(name, x) \ > DEFINE_PROP_BOOL(name, MigrationState, capabilities[x], false) > > @@ -173,6 +180,9 @@ Property migration_properties[] = { > DEFINE_PROP_ZERO_PAGE_DETECTION("zero-page-detection", MigrationState, > parameters.zero_page_detection, > ZERO_PAGE_DETECTION_MULTIFD), > + DEFINE_PROP_SIZE("multifd-packet-size", MigrationState, > + parameters.multifd_packet_size, > + DEFAULT_MIGRATE_MULTIFD_PACKET_SIZE), > > /* Migration capabilities */ > DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE), > @@ -783,6 +793,13 @@ int migrate_multifd_channels(void) > return s->parameters.multifd_channels; > } > > +uint64_t migrate_multifd_packet_size(void) > +{ > + MigrationState *s = migrate_get_current(); > + > + return s->parameters.multifd_packet_size; > +} > + > MultiFDCompression migrate_multifd_compression(void) > { > MigrationState *s = migrate_get_current(); > @@ -911,6 +928,8 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp) > params->downtime_limit = s->parameters.downtime_limit; > params->has_x_checkpoint_delay = true; > params->x_checkpoint_delay = s->parameters.x_checkpoint_delay; > + params->has_multifd_packet_size = true; > + params->multifd_packet_size = s->parameters.multifd_packet_size; > params->has_multifd_channels = true; > params->multifd_channels = s->parameters.multifd_channels; > params->has_multifd_compression = true; > @@ -973,6 +992,7 @@ void migrate_params_init(MigrationParameters *params) > params->has_max_bandwidth = true; > params->has_downtime_limit = true; > params->has_x_checkpoint_delay = true; > + params->has_multifd_packet_size = true; > params->has_multifd_channels = true; > params->has_multifd_compression = true; > params->has_multifd_zlib_level = true; > @@ -1055,6 +1075,19 @@ bool migrate_params_check(MigrationParameters *params, Error **errp) > > /* x_checkpoint_delay is now always positive */ > > + if (params->has_multifd_packet_size && > + ((params->multifd_packet_size < DEFAULT_MIGRATE_MULTIFD_PACKET_SIZE) || > + (params->multifd_packet_size > MAX_MIGRATE_MULTIFD_PACKET_SIZE) || > + (params->multifd_packet_size % qemu_target_page_size() != 0))) { > + error_setg(errp, QERR_INVALID_PARAMETER_VALUE, > + "multifd_packet_size", > + "an integer in the range of " > + stringify(DEFAULT_MIGRATE_MULTIFD_PACKET_SIZE) > + " to "stringify(MAX_MIGRATE_MULTIFD_PACKET_SIZE)", " > + "and must be a multiple of guest VM's page size."); > + return false; > + } > + > if (params->has_multifd_channels && (params->multifd_channels < 1)) { > error_setg(errp, QERR_INVALID_PARAMETER_VALUE, > "multifd_channels", > @@ -1236,6 +1269,9 @@ static void migrate_params_test_apply(MigrateSetParameters *params, > dest->x_checkpoint_delay = params->x_checkpoint_delay; > } > > + if (params->has_multifd_packet_size) { > + dest->multifd_packet_size = params->multifd_packet_size; > + } > if (params->has_multifd_channels) { > dest->multifd_channels = params->multifd_channels; > } > @@ -1364,6 +1400,9 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp) > colo_checkpoint_delay_set(); > } > > + if (params->has_multifd_packet_size) { > + s->parameters.multifd_packet_size = params->multifd_packet_size; > + } > if (params->has_multifd_channels) { > s->parameters.multifd_channels = params->multifd_channels; > } > diff --git a/migration/options.h b/migration/options.h > index 8198b220bd..8158d4879d 100644 > --- a/migration/options.h > +++ b/migration/options.h > @@ -87,6 +87,7 @@ const char *migrate_tls_hostname(void); > uint64_t migrate_xbzrle_cache_size(void); > ZeroPageDetection migrate_zero_page_detection(void); > const strList *migrate_dsa_accel_path(void); > +uint64_t migrate_multifd_packet_size(void); > > /* parameters helpers */ > > diff --git a/qapi/migration.json b/qapi/migration.json > index d8b42ceae6..1d14d8e82f 100644 > --- a/qapi/migration.json > +++ b/qapi/migration.json > @@ -851,6 +851,10 @@ > # only has effect if the @mapped-ram capability is enabled. > # (Since 9.1) > # > +# @multifd-packet-size: Packet size in bytes used to migrate data. > +# The value needs to be a multiple of guest page size. > +# The default value is 524288 and max value is 4190208. (Since 9.2) > +# > # Features: > # > # @unstable: Members @x-checkpoint-delay and > @@ -877,7 +881,8 @@ > 'vcpu-dirty-limit', > 'mode', > 'zero-page-detection', > - 'direct-io'] } > + 'direct-io', > + 'multifd-packet-size'] } > > ## > # @MigrateSetParameters: > @@ -1038,6 +1043,10 @@ > # only has effect if the @mapped-ram capability is enabled. > # (Since 9.1) > # > +# @multifd-packet-size: Packet size in bytes used to migrate data. > +# The value needs to be a multiple of guest page size. > +# The default value is 524288 and max value is 4190208. (Since 9.2) > +# > # Features: > # > # @unstable: Members @x-checkpoint-delay and > @@ -1080,7 +1089,8 @@ > '*mode': 'MigMode', > '*zero-page-detection': 'ZeroPageDetection', > '*direct-io': 'bool', > - '*dsa-accel-path': [ 'str' ] } } > + '*dsa-accel-path': [ 'str' ], > + '*multifd-packet-size' : 'uint64'} } > > ## > # @migrate-set-parameters: > @@ -1255,6 +1265,10 @@ > # only has effect if the @mapped-ram capability is enabled. > # (Since 9.1) > # > +# @multifd-packet-size: Packet size in bytes used to migrate data. > +# The value needs to be a multiple of guest page size. > +# The default value is 524288 and max value is 4190208. (Since 9.2) These will rot, better leave them out. > +# > # Features: > # > # @unstable: Members @x-checkpoint-delay and > @@ -1294,7 +1308,8 @@ > '*mode': 'MigMode', > '*zero-page-detection': 'ZeroPageDetection', > '*direct-io': 'bool', > - '*dsa-accel-path': [ 'str' ] } } > + '*dsa-accel-path': [ 'str' ], > + '*multifd-packet-size': 'uint64' } } > > ## > # @query-migrate-parameters:
diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c index 983f13b73c..561ed45250 100644 --- a/migration/migration-hmp-cmds.c +++ b/migration/migration-hmp-cmds.c @@ -292,6 +292,9 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict) monitor_printf(mon, "%s: %u ms\n", MigrationParameter_str(MIGRATION_PARAMETER_X_CHECKPOINT_DELAY), params->x_checkpoint_delay); + monitor_printf(mon, "%s: %" PRIu64 "\n", + MigrationParameter_str(MIGRATION_PARAMETER_MULTIFD_PACKET_SIZE), + params->multifd_packet_size); monitor_printf(mon, "%s: %u\n", MigrationParameter_str(MIGRATION_PARAMETER_MULTIFD_CHANNELS), params->multifd_channels); @@ -580,6 +583,10 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict) QAPI_LIST_APPEND(tail, strv[i]); } break; + case MIGRATION_PARAMETER_MULTIFD_PACKET_SIZE: + p->has_multifd_packet_size = true; + visit_type_size(v, param, &p->multifd_packet_size, &err); + break; case MIGRATION_PARAMETER_MULTIFD_CHANNELS: p->has_multifd_channels = true; visit_type_uint8(v, param, &p->multifd_channels, &err); diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c index 8cf8a26bb4..58c278533a 100644 --- a/migration/multifd-zlib.c +++ b/migration/multifd-zlib.c @@ -39,6 +39,7 @@ static int multifd_zlib_send_setup(MultiFDSendParams *p, Error **errp) struct zlib_data *z = g_new0(struct zlib_data, 1); z_stream *zs = &z->zs; const char *err_msg; + uint64_t multifd_packet_size = migrate_multifd_packet_size(); zs->zalloc = Z_NULL; zs->zfree = Z_NULL; @@ -48,7 +49,7 @@ static int multifd_zlib_send_setup(MultiFDSendParams *p, Error **errp) goto err_free_z; } /* This is the maximum size of the compressed buffer */ - z->zbuff_len = compressBound(MULTIFD_PACKET_SIZE); + z->zbuff_len = compressBound(multifd_packet_size); z->zbuff = g_try_malloc(z->zbuff_len); if (!z->zbuff) { err_msg = "out of memory for zbuff"; @@ -162,6 +163,7 @@ out: static int multifd_zlib_recv_setup(MultiFDRecvParams *p, Error **errp) { + uint64_t multifd_packet_size = migrate_multifd_packet_size(); struct zlib_data *z = g_new0(struct zlib_data, 1); z_stream *zs = &z->zs; @@ -176,7 +178,7 @@ static int multifd_zlib_recv_setup(MultiFDRecvParams *p, Error **errp) return -1; } /* To be safe, we reserve twice the size of the packet */ - z->zbuff_len = MULTIFD_PACKET_SIZE * 2; + z->zbuff_len = multifd_packet_size * 2; z->zbuff = g_try_malloc(z->zbuff_len); if (!z->zbuff) { inflateEnd(zs); diff --git a/migration/multifd-zstd.c b/migration/multifd-zstd.c index abed140855..1f97a5417c 100644 --- a/migration/multifd-zstd.c +++ b/migration/multifd-zstd.c @@ -39,6 +39,7 @@ struct zstd_data { static int multifd_zstd_send_setup(MultiFDSendParams *p, Error **errp) { + uint64_t multifd_packet_size = migrate_multifd_packet_size(); struct zstd_data *z = g_new0(struct zstd_data, 1); int res; @@ -58,7 +59,7 @@ static int multifd_zstd_send_setup(MultiFDSendParams *p, Error **errp) return -1; } /* This is the maximum size of the compressed buffer */ - z->zbuff_len = ZSTD_compressBound(MULTIFD_PACKET_SIZE); + z->zbuff_len = ZSTD_compressBound(multifd_packet_size); z->zbuff = g_try_malloc(z->zbuff_len); if (!z->zbuff) { ZSTD_freeCStream(z->zcs); @@ -149,6 +150,7 @@ out: static int multifd_zstd_recv_setup(MultiFDRecvParams *p, Error **errp) { + uint64_t multifd_packet_size = migrate_multifd_packet_size(); struct zstd_data *z = g_new0(struct zstd_data, 1); int ret; @@ -170,7 +172,7 @@ static int multifd_zstd_recv_setup(MultiFDRecvParams *p, Error **errp) } /* To be safe, we reserve twice the size of the packet */ - z->zbuff_len = MULTIFD_PACKET_SIZE * 2; + z->zbuff_len = multifd_packet_size * 2; z->zbuff = g_try_malloc(z->zbuff_len); if (!z->zbuff) { ZSTD_freeDStream(z->zds); diff --git a/migration/options.c b/migration/options.c index a0b3a7d291..b1eaf1c095 100644 --- a/migration/options.c +++ b/migration/options.c @@ -80,6 +80,13 @@ #define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS 5 #define DEFAULT_MIGRATE_ANNOUNCE_STEP 100 +/* + * Parameter for multifd packet size. + */ +#define DEFAULT_MIGRATE_MULTIFD_PACKET_SIZE (128 * 4 * 1024) +/* DSA device supports up to 1024 batches, i.e. 1024 * 4K pages */ +#define MAX_MIGRATE_MULTIFD_PACKET_SIZE (1024 * 4 * 1024) + #define DEFINE_PROP_MIG_CAP(name, x) \ DEFINE_PROP_BOOL(name, MigrationState, capabilities[x], false) @@ -173,6 +180,9 @@ Property migration_properties[] = { DEFINE_PROP_ZERO_PAGE_DETECTION("zero-page-detection", MigrationState, parameters.zero_page_detection, ZERO_PAGE_DETECTION_MULTIFD), + DEFINE_PROP_SIZE("multifd-packet-size", MigrationState, + parameters.multifd_packet_size, + DEFAULT_MIGRATE_MULTIFD_PACKET_SIZE), /* Migration capabilities */ DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE), @@ -783,6 +793,13 @@ int migrate_multifd_channels(void) return s->parameters.multifd_channels; } +uint64_t migrate_multifd_packet_size(void) +{ + MigrationState *s = migrate_get_current(); + + return s->parameters.multifd_packet_size; +} + MultiFDCompression migrate_multifd_compression(void) { MigrationState *s = migrate_get_current(); @@ -911,6 +928,8 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp) params->downtime_limit = s->parameters.downtime_limit; params->has_x_checkpoint_delay = true; params->x_checkpoint_delay = s->parameters.x_checkpoint_delay; + params->has_multifd_packet_size = true; + params->multifd_packet_size = s->parameters.multifd_packet_size; params->has_multifd_channels = true; params->multifd_channels = s->parameters.multifd_channels; params->has_multifd_compression = true; @@ -973,6 +992,7 @@ void migrate_params_init(MigrationParameters *params) params->has_max_bandwidth = true; params->has_downtime_limit = true; params->has_x_checkpoint_delay = true; + params->has_multifd_packet_size = true; params->has_multifd_channels = true; params->has_multifd_compression = true; params->has_multifd_zlib_level = true; @@ -1055,6 +1075,19 @@ bool migrate_params_check(MigrationParameters *params, Error **errp) /* x_checkpoint_delay is now always positive */ + if (params->has_multifd_packet_size && + ((params->multifd_packet_size < DEFAULT_MIGRATE_MULTIFD_PACKET_SIZE) || + (params->multifd_packet_size > MAX_MIGRATE_MULTIFD_PACKET_SIZE) || + (params->multifd_packet_size % qemu_target_page_size() != 0))) { + error_setg(errp, QERR_INVALID_PARAMETER_VALUE, + "multifd_packet_size", + "an integer in the range of " + stringify(DEFAULT_MIGRATE_MULTIFD_PACKET_SIZE) + " to "stringify(MAX_MIGRATE_MULTIFD_PACKET_SIZE)", " + "and must be a multiple of guest VM's page size."); + return false; + } + if (params->has_multifd_channels && (params->multifd_channels < 1)) { error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "multifd_channels", @@ -1236,6 +1269,9 @@ static void migrate_params_test_apply(MigrateSetParameters *params, dest->x_checkpoint_delay = params->x_checkpoint_delay; } + if (params->has_multifd_packet_size) { + dest->multifd_packet_size = params->multifd_packet_size; + } if (params->has_multifd_channels) { dest->multifd_channels = params->multifd_channels; } @@ -1364,6 +1400,9 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp) colo_checkpoint_delay_set(); } + if (params->has_multifd_packet_size) { + s->parameters.multifd_packet_size = params->multifd_packet_size; + } if (params->has_multifd_channels) { s->parameters.multifd_channels = params->multifd_channels; } diff --git a/migration/options.h b/migration/options.h index 8198b220bd..8158d4879d 100644 --- a/migration/options.h +++ b/migration/options.h @@ -87,6 +87,7 @@ const char *migrate_tls_hostname(void); uint64_t migrate_xbzrle_cache_size(void); ZeroPageDetection migrate_zero_page_detection(void); const strList *migrate_dsa_accel_path(void); +uint64_t migrate_multifd_packet_size(void); /* parameters helpers */ diff --git a/qapi/migration.json b/qapi/migration.json index d8b42ceae6..1d14d8e82f 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -851,6 +851,10 @@ # only has effect if the @mapped-ram capability is enabled. # (Since 9.1) # +# @multifd-packet-size: Packet size in bytes used to migrate data. +# The value needs to be a multiple of guest page size. +# The default value is 524288 and max value is 4190208. (Since 9.2) +# # Features: # # @unstable: Members @x-checkpoint-delay and @@ -877,7 +881,8 @@ 'vcpu-dirty-limit', 'mode', 'zero-page-detection', - 'direct-io'] } + 'direct-io', + 'multifd-packet-size'] } ## # @MigrateSetParameters: @@ -1038,6 +1043,10 @@ # only has effect if the @mapped-ram capability is enabled. # (Since 9.1) # +# @multifd-packet-size: Packet size in bytes used to migrate data. +# The value needs to be a multiple of guest page size. +# The default value is 524288 and max value is 4190208. (Since 9.2) +# # Features: # # @unstable: Members @x-checkpoint-delay and @@ -1080,7 +1089,8 @@ '*mode': 'MigMode', '*zero-page-detection': 'ZeroPageDetection', '*direct-io': 'bool', - '*dsa-accel-path': [ 'str' ] } } + '*dsa-accel-path': [ 'str' ], + '*multifd-packet-size' : 'uint64'} } ## # @migrate-set-parameters: @@ -1255,6 +1265,10 @@ # only has effect if the @mapped-ram capability is enabled. # (Since 9.1) # +# @multifd-packet-size: Packet size in bytes used to migrate data. +# The value needs to be a multiple of guest page size. +# The default value is 524288 and max value is 4190208. (Since 9.2) +# # Features: # # @unstable: Members @x-checkpoint-delay and @@ -1294,7 +1308,8 @@ '*mode': 'MigMode', '*zero-page-detection': 'ZeroPageDetection', '*direct-io': 'bool', - '*dsa-accel-path': [ 'str' ] } } + '*dsa-accel-path': [ 'str' ], + '*multifd-packet-size': 'uint64' } } ## # @query-migrate-parameters: