Re: Need help with NFS Server SUNRPC performance issue

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On Thu, Oct 31, 2013 at 10:45:46AM -0400, Michael Richardson wrote:
> 
>     >> I am chasing a NFS server performance issue on Ubuntu
>     >> 3.8.13-030813-generic kernel. We setup 32 NFSD threads on our NFS
>     >> server.
> 
> I have been also trying to figure out NFS performance issues at my home
> office.  Server is ubuntu precise (3.2.0-55, old, true) kernel, and clients
> are mostly a mix of Debian versions (mostly virtualized XEN).
> GbE over a VLAN is setup just for storage, and mostly IPv6 connections.
> 
> J. Bruce Fields <bfields@xxxxxxxxxxxx> wrote:
>     > Would you be willing to test an upstream kernel and/or some patches?
>     > Sounds like you're using only NFSv4?
> 
> I'm also willing to; my preference would be to build a generic 3.10 or 3.11
> kernel with NFS as a module, and then update the NFS code, but I
> haven't gotten around to scheduling some time to reboot a bunch.
> 
> What I observe is huge TCP send queues on the server and what appears to be
> head of queue blocking on the client.  This looks like a client issue to me,
> and for at least one client (my mpd/shoutcast server), I'm happy to reboot
> it regularly... I notice the NFS delays because the music stops :-)
> 
> There are some potential instabilities in frequency of IPv6 Router
> Advertisements due to a bug in the CeroWRT, which initially I was blaming,
> but I'm no longer convinced, since it happens over IPv4 on the storage VLAN
> too.
> 
> Shyam, please share with me your testing strategy.

Your problem sounds different; among other things, it's with reads
rather than writes.

Yes, testing with a recent upstream kernel would be a good start.  3.11
or more recent would be ideal as there was a fix for read deadlocks
there (which I doubt you're hitting, but would be nice to rule it out).

--b.
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