Date: Tue, 09 Jul 2013 14:20:05 +1200 From: Berend de Boer <berend@pobox.com> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: Terrible NFS4 performance: FreeBSD 9.1 + ZFS + AWS EC2 Message-ID: <87k3l0zd7u.wl%berend@pobox.com> In-Reply-To: <580122426.2916694.1373242759482.JavaMail.root@uoguelph.ca> References: <87y59i0yni.wl%berend@pobox.com> <580122426.2916694.1373242759482.JavaMail.root@uoguelph.ca>
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>>>>> "Rick" == Rick Macklem <rmacklem@uoguelph.ca> writes:
Rick> After you apply the patch and boot the rebuilt kernel, the
Rick> cpu overheads should be reduced after you increase the value
Rick> of vfs.nfsd.tcphighwater.
Have set it to 10,000, max cpu for nfsd I've seen is below 6%. Makes
no real difference whatsoever to the great slowness of nfs4 in this
use-case.
I.e. did two tests: 17.5 minutes with sync=disabled, 21.5 minutes with
sync=enabled, but difference in this case could simply be due to
whatever else was going on that that time.
FYI, in the nfs3 mount nfsd is at 0% at all times, basically uses no
cpu whatsoever.
The weird thing is that nfs3 performance seems to have been greatly
affected: the same test which ran at 2 minutes on udp is now between 7-11
minutes.
As this could be a problem with how I'm testing now (I recompiled the
kernel), I'll try to see what numbers I get when I undo the patch and
work against a recompiled kernel.
--
All the best,
Berend de Boer
------------------------------------------------------
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