summaryrefslogtreecommitdiff
path: root/README
diff options
context:
space:
mode:
authorD. Wythe <alibuda@linux.alibaba.com>2023-02-02 16:26:40 +0800
committerDavid S. Miller <davem@davemloft.net>2023-02-04 09:48:19 +0000
commitf6421014e88983c5bb7a25c71c01ae6278a01df9 (patch)
tree61e10bb4014ad23c41ed6d7c0714024cbd4c0ba1 /README
parentb5dd4d6981717f7e2682c0419fe832328c7441cf (diff)
downloadlinux-f6421014e88983c5bb7a25c71c01ae6278a01df9.tar.gz
net/smc: use read semaphores to reduce unnecessary blocking in smc_buf_create() & smcr_buf_unuse()
Following is part of Off-CPU graph during frequent SMC-R short-lived processing: process_one_work (51.19%) smc_close_passive_work (28.36%) smcr_buf_unuse (28.34%) rwsem_down_write_slowpath (28.22%) smc_listen_work (22.83%) smc_clc_wait_msg (1.84%) smc_buf_create (20.45%) smcr_buf_map_usable_links rwsem_down_write_slowpath (20.43%) smcr_lgr_reg_rmbs (0.53%) rwsem_down_write_slowpath (0.43%) smc_llc_do_confirm_rkey (0.08%) We can clearly see that during the connection establishment time, waiting time of connections is not on IO, but on llc_conf_mutex. What is more important, the core critical area (smcr_buf_unuse() & smc_buf_create()) only perfroms read semantics on links, we can easily replace it with read semaphore. Signed-off-by: D. Wythe <alibuda@linux.alibaba.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions