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| author | Richard Scheffenegger <rscheff@FreeBSD.org> | 2021-03-31 17:24:01 +0000 |
|---|---|---|
| committer | Richard Scheffenegger <rscheff@FreeBSD.org> | 2021-04-16 21:33:20 +0000 |
| commit | a85003abdad402c27c12cf1a31b243c39483f263 (patch) | |
| tree | c45e9b8c36fd9aa5f455292b62343b80237f7059 | |
| parent | c449b8a71bce7d7838164f6a5595f71c91b5b91b (diff) | |
| download | src-a85003abdad402c27c12cf1a31b243c39483f263.tar.gz src-a85003abdad402c27c12cf1a31b243c39483f263.zip | |
tcp: drain tcp_hostcache_list in between per-bucket locks
Explicitly drain the sbuf after completing each hash bucket
to minimize the work performed while holding the hash
bucket lock.
PR: 254333
MFC after: 2 weeks
Reviewed By: tuexen, jhb, #transport
Sponsored by: NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D29483
(cherry picked from commit 869880463cc2ce64e2e6599eaec880a981f3ced6)
| -rw-r--r-- | sys/netinet/tcp_hostcache.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sys/netinet/tcp_hostcache.c b/sys/netinet/tcp_hostcache.c index e71f13243f0c..c4d51dd0bd59 100644 --- a/sys/netinet/tcp_hostcache.c +++ b/sys/netinet/tcp_hostcache.c @@ -642,12 +642,13 @@ sysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS) return(error); } - /* Use a buffer for 16 lines */ - sbuf_new_for_sysctl(&sb, NULL, 16 * linesize, req); + /* Use a buffer sized for one full bucket */ + sbuf_new_for_sysctl(&sb, NULL, V_tcp_hostcache.bucket_limit * linesize, req); sbuf_printf(&sb, "\nIP address MTU SSTRESH RTT RTTVAR " " CWND SENDPIPE RECVPIPE HITS UPD EXP\n"); + sbuf_drain(&sb); #define msec(u) (((u) + 500) / 1000) for (i = 0; i < V_tcp_hostcache.hashsize; i++) { @@ -678,6 +679,7 @@ sysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS) hc_entry->rmx_expire); } THC_UNLOCK(&V_tcp_hostcache.hashbase[i].hch_mtx); + sbuf_drain(&sb); } #undef msec error = sbuf_finish(&sb); |