Date: Tue, 9 Mar 2010 07:44:09 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-hackers@freebsd.org Cc: volker@vwsoft.com, freebsd-net@freebsd.org, Giulio Ferro <auryn@zirakzigil.org> Subject: Re: NFS Client error Message-ID: <201003090744.09149.jhb@freebsd.org> In-Reply-To: <4B958151.8060707@vwsoft.com> References: <4B94DC74.7070001@zirakzigil.org> <4B958151.8060707@vwsoft.com>
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On Monday 08 March 2010 5:59:29 pm volker@vwsoft.com wrote:
> On 03/08/10 12:16, Giulio Ferro wrote:
> > Freebsd 8 stable amd64
> >
> > It mounts different file systems by NFS (with locking) on a
> > data server directly connected (gigabit) to the server
> >
> > Apache running in a several jails on those nfs folders.
> >
> > Now and then I get huge slow-down. When I look in the logs
> > I get thousand of lines like these:
> > Mar 5 11:50:52 virt2 kernel: vm_fault: pager read error, pid 46487
(httpd)
> > Mar 5 11:50:52 virt2 kernel: pid 46487 (httpd), uid 80: exited on
> > signal 11
> >
> >
> > What should I do?
>
> Giulio,
>
> it seems this is anyhow not related to network (nfs) operations. It's
> looking like a problem in the VM. I think it makes sense to have a look
> at the httpd.core file if the binary has been linked with debugging
> symbols turned on. Also I think at first, it may not hurt to look at
> vmstat -m output.
>
> You may want to change ${subject} and post to stable@ to drive more
> attention to your problem.
That's not quite true. If you take a page fault on a mmap'd file backed by
NFS (e.g. an executable or shared library) and an NFS READ RPC to satisfy the
page fault fails, then you could get this error.
--
John Baldwin
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