Date: Sun, 4 Aug 2013 18:43:31 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: Berend de Boer <berend@pobox.com> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: Terrible NFS4 performance: FreeBSD 9.1 + UFS/ZFS + AWS EC2 Message-ID: <217266388.5736789.1375656211230.JavaMail.root@uoguelph.ca> In-Reply-To: <87iozr5c03.wl%berend@pobox.com>
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Berend de Boer wrote: > >>>>> "Julian" == Julian Elischer <julian@freebsd.org> writes: > > Julian> Recent evidence with AWS is suggesting that the > Julian> NOADAPTIVE_XXX options in the XENHVM kernel are now > Julian> seriously hindering AWS performance all over the place. > Julian> make sure you have tried with these options removed. > > Julian, on the same machine nfs3 is better than Linux, and nfs4 is > terrible. > All I could tell from the packet trace is that it is doing a massive number of lookups. I have no idea why the client does this, but it could possibly be the way the system is storing directory modify times and the change attribute (which is kinda like a modify time, in that it changes whenever a file's data or metadata changes, for NFSv4 only). I know absolutely nothing about this virtualized environment, so all I can suggest is trying "real hardware" to see if the same behaviour occurs when the server is running on a real hardware box. rick > > -- > All the best, > > Berend de Boer > > > ------------------------------------------------------ > Awesome Drupal hosting: https://www.xplainhosting.com/ > >
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