Date: Wed, 18 Aug 2021 09:50:49 GMT From: Mateusz Guzik <mjg@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 2da4005188ce - stable/12 - frag6: do less work in frag6_slowtimo if possible Message-ID: <202108180950.17I9onfY086804@gitrepo.freebsd.org>
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The branch stable/12 has been updated by mjg: URL: https://cgit.FreeBSD.org/src/commit/?id=2da4005188ced25eee5ccb803586bf31f4574fca commit 2da4005188ced25eee5ccb803586bf31f4574fca Author: Mateusz Guzik <mjg@FreeBSD.org> AuthorDate: 2021-08-13 11:32:03 +0000 Commit: Mateusz Guzik <mjg@FreeBSD.org> CommitDate: 2021-08-18 09:48:22 +0000 frag6: do less work in frag6_slowtimo if possible frag6_slowtimo avoidably uses CPU on otherwise idle boxes Reviewed by: kp Sponsored by: Rubicon Communications, LLC ("Netgate") Differential Revision: https://reviews.freebsd.org/D31528 (cherry picked from commit 8afe9481cfa382337b8a885f358fe888bddf5982) --- sys/netinet6/frag6.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/sys/netinet6/frag6.c b/sys/netinet6/frag6.c index d27d21e536fe..5a31bbff9747 100644 --- a/sys/netinet6/frag6.c +++ b/sys/netinet6/frag6.c @@ -901,10 +901,15 @@ frag6_slowtimo(void) struct ip6q *q6, *q6tmp; uint32_t bucket; + if (atomic_load_int(&frag6_nfrags) == 0) + return; + VNET_LIST_RLOCK_NOSLEEP(); VNET_FOREACH(vnet_iter) { CURVNET_SET(vnet_iter); for (bucket = 0; bucket < IP6REASS_NHASH; bucket++) { + if (V_ip6qb[bucket].count == 0) + continue; IP6QB_LOCK(bucket); head = IP6QB_HEAD(bucket); TAILQ_FOREACH_SAFE(q6, head, ip6q_tq, q6tmp)
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