High traffic NFS performance and availability problems

Martin Nilsson martin at gneto.com
Tue Feb 22 01:45:36 PST 2005

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).


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