netdev - [PATCH net-next 0/3] Reduce locks scope of-smc_xxx_lgr

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Message-ID: <20241113071405.67421-1-alibuda@linux.alibaba.com>
Date: Wed, 13 Nov 2024 15:14:02 +0800
From: "D. Wythe" <alibuda@...ux.alibaba.com>
To: kgraul@...ux.ibm.com,
	wenjia@...ux.ibm.com,
	jaka@...ux.ibm.com,
	wintera@...ux.ibm.com,
	guwen@...ux.alibaba.com
Cc: kuba@...nel.org,
	davem@...emloft.net,
	netdev@...r.kernel.org,
	linux-s390@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	tonylu@...ux.alibaba.com,
	pabeni@...hat.com,
	edumazet@...gle.com
Subject: [PATCH net-next 0/3] Reduce locks scope of-smc_xxx_lgr_pending

This patch set attempts to optimize the parallelism of SMC-R connections by reducing
locks scope of-smc_xxx_lgr_pending. This is a balance between large-scale refactoring
and performance optimization, where this patch attempts to achieve performance optimization
with as few changes as possible to minimize unexpected impacts.

Although there are still many bottlenecks that affect the connection performance of SMC, 
This also has a certain performance improvement after this patches.

Short-lived conenction wrk/nginx benchmark test:

+--------------+--------+--------+--------+-------+-------+-------+-------+
|conns/qps     |   c8   |  c16   |  c32   |  c64  | c512  | c1024 | c2048 |
+--------------+--------+--------+--------+-------+-------+-------+-------+
|SMC-R before  |10481.84|10761.04|10283.01|9006.88|9140.88|9255.41|7296.20|
+--------------+--------+--------+--------+-------+-------+-------+-------+
|SMC-R origin  |7328.86 |7256.99 |7288.53 |7239.55|5787.56|5371.17|3065.74|
+--------------+--------+--------+--------+-------+-------+-------+-------+

D. Wythe (3):
  net/smc: refactoring lgr pending lock
  net/smc: reduce locks scope of smc_xxx_lgr_pending
  net/smc: Isolate the smc_xxx_lgr_pending with ib_device

 net/smc/af_smc.c   | 36 +++++++++++++++++++-----------------
 net/smc/smc_core.c | 17 +++++++++++++++--
 net/smc/smc_core.h | 29 +++++++++++++++++++++++++++++
 net/smc/smc_ib.c   |  2 ++
 net/smc/smc_ib.h   |  2 ++
 5 files changed, 67 insertions(+), 19 deletions(-)

-- 
2.45.0