diff options
| author | Richard Scheffenegger <rscheff@FreeBSD.org> | 2021-04-01 08:00:32 +0000 |
|---|---|---|
| committer | Richard Scheffenegger <rscheff@FreeBSD.org> | 2021-04-16 19:44:00 +0000 |
| commit | 4052275c2fc5f96b4a208404733713959afe68f6 (patch) | |
| tree | fc7a25c39a1be2445aacfecc3b8eef22840665a6 /sys/netinet/tcp_hostcache.h | |
| parent | 632e3363087cb6ef2a7b26a291a044b97afabea7 (diff) | |
tcp: For hostcache performance, use atomics instead of counters
As accessing the tcp hostcache happens frequently on some
classes of servers, it was recommended to use atomic_add/subtract
rather than (per-CPU distributed) counters, which have to be
summed up at high cost to cache efficiency in a hot codepath.
PR: 254333
MFC after: 2 weeks
Sponsored by: NetApp, Inc.
Reviewed By: #transport, tuexen, jtl
Differential Revision: https://reviews.freebsd.org/D29522
(cherry picked from commit 529a2a0f2765f6c57c50a5af6be242c03bf714e3)
Diffstat (limited to 'sys/netinet/tcp_hostcache.h')
| -rw-r--r-- | sys/netinet/tcp_hostcache.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/netinet/tcp_hostcache.h b/sys/netinet/tcp_hostcache.h index b5237392acc2..2f7035c0c6af 100644 --- a/sys/netinet/tcp_hostcache.h +++ b/sys/netinet/tcp_hostcache.h @@ -74,7 +74,7 @@ struct tcp_hostcache { u_int hashsize; u_int hashmask; u_int bucket_limit; - counter_u64_t cache_count; + u_int cache_count; u_int cache_limit; int expire; int prune; |