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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, rds-devel@oss.oracle.com Subject: [MAINLINE 2/2] rds: ib: Add Dynamic Interrupt Moderation to CQs Date: Wed, 18 Sep 2024 10:35:52 +0200 Message-ID: <20240918083552.77531-3-haakon.bugge@oracle.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20240918083552.77531-1-haakon.bugge@oracle.com> References: <20240918083552.77531-1-haakon.bugge@oracle.com> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-18_06,2024-09-16_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 bulkscore=0 adultscore=0 malwarescore=0 suspectscore=0 phishscore=0 spamscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2408220000 definitions=main-2409180053 X-Proofpoint-ORIG-GUID: Er6aC43qNf_iuriETv9reMtU3vz_rDQJ X-Proofpoint-GUID: Er6aC43qNf_iuriETv9reMtU3vz_rDQJ With the support from ib_core to use Dynamic Interrupt Moderation (DIM) from legacy ULPs, which uses ib_create_cq(), we enable that feature for the receive and send CQs in RDS. A set of rds-stress runs have been done. bcopy read + write for payload 8448 and 16640 bytes and ack/req of 256 bytes. Number of QPs varies from 8 to 128, number of threads (i.e. rds-stress processes) from one to 16 and a depth of four. A limit has been applied such that the number of processes times the number of QPs never exceeds 128. All in all, 61 rds-stress runs. For brevity, only the rows showing a +/- 3% deviation or larger from base is listed. The geometric mean of the ratios (IOPS_test / IOPS_base) is calculated for all 61 runs, and that gives the best possible "average" impact of the commits. In the following, "base" is v6.11-rc7. "test" is the same kernel with the following two commits: * rds: ib: Add Dynamic Interrupt Moderation to CQs (this commit) * RDMA/core: Enable legacy ULPs to use RDMA DIM This is executed between two X8-2 with CX-5 using fw 16.35.3502. These BM systems were instantiated with one VF, which were used for the test: base test ACK REQ QPS THR DEP IOPS IOPS Percent 256 8448 8 1 4 634463 658162 3.7 256 8448 8 2 4 862648 997358 15.6 256 8448 8 4 4 950458 1113991 17.2 256 8448 8 8 4 932120 1127024 20.9 256 8448 8 16 4 944977 1133885 20.0 8448 256 8 2 4 858663 975563 13.6 8448 256 8 4 4 934884 1098854 17.5 8448 256 8 8 4 928247 1116015 20.2 8448 256 8 16 4 938864 1123455 19.7 256 8448 64 1 4 965985 918445 -4.9 8448 256 64 1 4 963280 918239 -4.7 256 16640 8 2 4 544670 582330 6.9 256 16640 8 4 4 554873 597553 7.7 256 16640 8 8 4 551799 597479 8.3 256 16640 8 16 4 553041 597898 8.1 16640 256 8 2 4 544644 578331 6.2 16640 256 8 4 4 553944 594627 7.3 16640 256 8 8 4 551388 594737 7.9 16640 256 8 16 4 552986 596581 7.9 Geometric mean of ratios: 1.03 Signed-off-by: Håkon Bugge --- net/rds/ib_cm.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c index 26b069e1999df..79603d86b6c02 100644 --- a/net/rds/ib_cm.c +++ b/net/rds/ib_cm.c @@ -259,6 +259,7 @@ static void rds_ib_cq_comp_handler_recv(struct ib_cq *cq, void *context) static void poll_scq(struct rds_ib_connection *ic, struct ib_cq *cq, struct ib_wc *wcs) { + int ncompleted = 0; int nr, i; struct ib_wc *wc; @@ -276,7 +277,10 @@ static void poll_scq(struct rds_ib_connection *ic, struct ib_cq *cq, rds_ib_mr_cqe_handler(ic, wc); } + ncompleted += nr; } + if (cq->dim) + rdma_dim(cq->dim, ncompleted); } static void rds_ib_tasklet_fn_send(unsigned long data) @@ -304,6 +308,7 @@ static void poll_rcq(struct rds_ib_connection *ic, struct ib_cq *cq, struct ib_wc *wcs, struct rds_ib_ack_state *ack_state) { + int ncompleted = 0; int nr, i; struct ib_wc *wc; @@ -316,7 +321,10 @@ static void poll_rcq(struct rds_ib_connection *ic, struct ib_cq *cq, rds_ib_recv_cqe_handler(ic, wc, ack_state); } + ncompleted += nr; } + if (cq->dim) + rdma_dim(cq->dim, ncompleted); } static void rds_ib_tasklet_fn_recv(unsigned long data) @@ -542,6 +550,7 @@ static int rds_ib_setup_qp(struct rds_connection *conn) ic->i_scq_vector = ibdev_get_unused_vector(rds_ibdev); cq_attr.cqe = ic->i_send_ring.w_nr + fr_queue_space + 1; cq_attr.comp_vector = ic->i_scq_vector; + cq_attr.flags |= IB_CQ_MODERATE; ic->i_send_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_send, rds_ib_cq_event_handler, conn, &cq_attr); @@ -556,6 +565,7 @@ static int rds_ib_setup_qp(struct rds_connection *conn) ic->i_rcq_vector = ibdev_get_unused_vector(rds_ibdev); cq_attr.cqe = ic->i_recv_ring.w_nr; cq_attr.comp_vector = ic->i_rcq_vector; + cq_attr.flags |= IB_CQ_MODERATE; ic->i_recv_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_recv, rds_ib_cq_event_handler, conn, &cq_attr);