Re: NFS Client error

On 03/09/10 13:44, John Baldwin wrote:
On Monday 08 March 2010 5:59:29 pm volker@xxxxxxxxxx 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,

thank you for pointing that out. I've forgotten the mmap'ing of files
over nfs as a possible source of that problem.

With 8-stable I'm seeing mbufs leaking with nfs operation. It may or may
not be related to Giulio's problem.

Volker
_______________________________________________
freebsd-net@xxxxxxxxxxx mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-net
To unsubscribe, send any mail to "freebsd-net-unsubscribe@xxxxxxxxxxx"

Relevant Pages

  • Re: NFS Client error
    ... 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. ... page fault fails, then you could get this error. ...
    (freebsd-net)
  • Re: NFS Client error
    ... Apache running in a several jails on those nfs folders. ... page fault fails, then you could get this error. ... With 8-stable I'm seeing mbufs leaking with nfs operation. ...
    (freebsd-hackers)
  • Re: NFS Client error
    ... 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. ... page fault fails, then you could get this error. ...
    (freebsd-hackers)
  • Re: nullfs in 4.10
    ... Or those that run user shells within jails. ... I changed to using NFS loopback mounts within jails, ... Oliver Fromme, secnetix GmbH & Co KG, Oettingenstr. ...
    (freebsd-stable)
  • Re: ZFS to support chflags?
    ... problems when I installworld an NFS root on the NFS host, then try to work with it over NFS from the NFS-booted system, as the flags can't be removed via NFS. ... They don't offer a security benefit as-installed, and perhaps offer a benefit with respect to preventing people from shooting themselves in the foot. ... E.g. hardlink system binaries over multiple jails flaged immuteable. ... the standard installworld doesn't do this. ...
    (freebsd-current)