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Use an RLOCK here instead of an RWLOCK - matching all the other calls

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to lla_lookup().

This drastically reduces the very high lock contention when doing parallel
TCP throughput tests (> 1024 sockets) with IPv6.

Tested:

* parallel IPv6 TCP bulk data exchange, 8192 sockets

MFC after:	1 week
Sponsored by:	Netflix, Inc.
This commit is contained in:
adrian 2014-01-01 00:56:26 +00:00
parent 82c2441b7d
commit 64782f1b07
1 changed files with 2 additions and 2 deletions
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4
sys/netinet6/nd6.c
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@ -1891,9 +1891,9 @@ nd6_output_lle(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
flags = ((m != NULL) || (lle != NULL)) ? LLE_EXCLUSIVE : 0;
if (ln == NULL) {
retry:
IF_AFDATA_LOCK(ifp);
IF_AFDATA_RLOCK(ifp);
ln = lla_lookup(LLTABLE6(ifp), flags, (struct sockaddr *)dst);
IF_AFDATA_UNLOCK(ifp);
IF_AFDATA_RUNLOCK(ifp);
if ((ln == NULL) && nd6_is_addr_neighbor(dst, ifp)) {
/*
* Since nd6_is_addr_neighbor() internally calls nd6_lookup(),