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Date: Tue, 22 Feb 2005 10:45:32 +0100
From: Martin Nilsson <martin@gneto.com>
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To: Robert Watson <rwatson@FreeBSD.org>
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cc: David Rice <drice@globat.com>
cc: freebsd-performance@FreeBSD.org
Subject: Re: High traffic NFS performance and availability problems
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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