Date: Tue, 22 Feb 2005 10:45:32 +0100 From: Martin Nilsson <martin@gneto.com> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-performance@FreeBSD.org Subject: Re: High traffic NFS performance and availability problems Message-ID: <421AFF3C.8090608@gneto.com> In-Reply-To: <Pine.NEB.3.96L.1050221212016.30319D-100000@fledge.watson.org> References: <Pine.NEB.3.96L.1050221212016.30319D-100000@fledge.watson.org>
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Robert Watson wrote: > In the top output below, it looks like there's a lot of contention on > Giant. In 5.3-RELEASE and before, the amr driver is not MPSAFE, but my > understanding is that in 5-STABLE, it has been made MPSAFE, which may make > quite a difference in performance. I pinged Scott Long, who did the work The locking of amr have not been MFC:d to RELENG_5 yet, I've just checked with webcvs. From my brief and unconclusive tests the locked driver was much faster (about 2x on sequential transfers). /Martin
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