6.1-RELEASE, em0 high interrupt rate and nfsd eats lots of cpu

[Howard Leadmon]

  Ahh, this might be my nfs problem I am now seeing, see my other posting to
this list about that issue.   If anyone knows of a fix for this, outside of
downgrading to 6.0 please let me know.   It's for sure a nusiance when I have
half dozen other machines that NFS to that server.  I don't have em0, but do
have fxp0, and am seeing massive CPU if I do something like a du on the NFS
mount.



---
Howard Leadmon
http://www.leadmon.net

 

> -----Original Message-----
> From: owner-freebsd-stable at freebsd.org 
> [mailto:owner-freebsd-stable at freebsd.org] On Behalf Of Rong-en Fan
> Sent: Monday, May 15, 2006 9:24 PM
> To: stable at freebsd.org
> Subject: Re: 6.1-RELEASE, em0 high interrupt rate and nfsd 
> eats lots of cpu
> 
> On 5/15/06, Dmitriy Kirhlarov <dkirhlarov at oilspace.com> wrote:
> > On Mon, May 15, 2006 at 02:15:08PM -0400, Rong-en Fan wrote:
> > > Hi,
> > >
> > > After upgrading from 5.5-PRERELEASE to 6.1-RELEASE on one 
> nfs server 
> > > today, I noticed that the load is very high, ranging from 4.x to 
> > > 30.x, depends how many nfsd I run. From mrtg traffic graph, I did 
> > > not notice there is high traffic. This box is 2 physical 
> Xeon CPU w/
> >
> > I have same situation today on RC2.
> > One client installing world from nfs share.
> > nfsd eat 91% CPU, load average 6-8. Very small disk activitie.
> > I don't look interrupt rate.
> > I, also, have em0.
> 
> After some digging, I found the cpu-eater nfsd can be 
> triggered by running ``du'' on nfs client (both FreeBSD 6.1-R 
> and Linux box).
> The nfsd will eat lots of CPU. After the client's du is 
> finished, the nfsd still eat lots of CPU. The workaround is to
> 
> /etc/rc.d/nfsd restart
> 
> Everything will be just fine. Besides du, on FreeBSD 6.1-R 
> client, buildkernel over nfs will trigger the same behavior.
> 
> I just downgraded this box to 6.0-RELEASE and everything 
> works fine. Running du or buildkernel from nfs client do not 
> trigger the same behavior. I will try to do a binary search 
> from 6.0-R to 6.1-R see if I can find out related commits.
> 
> By the way, I have another nfs server running 6.1-RELEASE, 
> but it does not exhibit this behavior. Kernel conf and sysctl 
> are basically the same for both boxes.
> 
> Regards,
> Rong-En Fan
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