| Message ID | 20220124202457.3450198-1-eric.dumazet@gmail.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | netns: speedup netns dismantles | expand |
On Mon, 24 Jan 2022 12:24:51 -0800 Eric Dumazet wrote: > From: Eric Dumazet <edumazet@google.com> > > netns are dismantled by a single thread, from cleanup_net() > > On hosts with many TCP sockets, and/or many cpus, this thread > is spending too many cpu cycles, and can not keep up with some > workloads. > > - Removing 3*num_possible_cpus() sockets per netns, for icmp and tcp protocols. > - Iterating over all TCP sockets to remove stale timewait sockets. > > This patch series removes ~50% of cleanup_net() cpu costs on > hosts with 256 cpus. It also reduces per netns memory footprint. Applied, thanks, 51d555cfdcc6 ("Merge branch 'netns-speedup-dismantle'") in net-next.
From: Eric Dumazet <edumazet@google.com> netns are dismantled by a single thread, from cleanup_net() On hosts with many TCP sockets, and/or many cpus, this thread is spending too many cpu cycles, and can not keep up with some workloads. - Removing 3*num_possible_cpus() sockets per netns, for icmp and tcp protocols. - Iterating over all TCP sockets to remove stale timewait sockets. This patch series removes ~50% of cleanup_net() cpu costs on hosts with 256 cpus. It also reduces per netns memory footprint. Eric Dumazet (6): tcp/dccp: add tw->tw_bslot tcp/dccp: no longer use twsk_net(tw) from tw_timer_handler() tcp/dccp: get rid of inet_twsk_purge() ipv4: do not use per netns icmp sockets ipv6: do not use per netns icmp sockets ipv4/tcp: do not use per netns ctl sockets include/net/inet_timewait_sock.h | 8 ++- include/net/netns/ipv4.h | 2 - include/net/netns/ipv6.h | 1 - net/dccp/ipv4.c | 6 --- net/dccp/ipv6.c | 6 --- net/ipv4/icmp.c | 91 +++++++++++--------------------- net/ipv4/inet_timewait_sock.c | 67 ++++------------------- net/ipv4/tcp_ipv4.c | 63 ++++++++++------------ net/ipv6/icmp.c | 62 ++++------------------ net/ipv6/tcp_ipv6.c | 6 --- 10 files changed, 82 insertions(+), 230 deletions(-)