Xen devel - May 2005 - RE: copying large files over NFS locks up machine on-testing from Thursday

> I just tried copying the 3GB file over NFS from within a domU 
> on -testing in hopes of getting some debug info. dom0 became 
> unresponsive for a few seconds after close to a minute. It 
> had successfully copied 2.3GB when I hit ^C and then started 
> a copy from NFS to the domU''s / which itself is a loopback 
> device mounted over NFS in dom0 - shortly thereafter the 
> machine locked up, the only output being complaints from 
> megaraid about aborted SCSI commands. It seems possible that 
> this is a dom0 issue.
It sounds like the megaraid driver is unhappy. Can you reproduce this
copying the file to /dev/null?

It''s worth checking the Dell site to make sure you have the latest
megaraid firmware and driver.

Ian

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> It sounds like the megaraid driver is unhappy. Can you reproduce this
> copying the file to /dev/null?
I think it was unhappy because its interrupts weren''t being serviced.
Copying /home/kmacy/suseroot.0 to /home/kmacy/suseroot.1 (NFS -> NFS)
locks the machine up just fine. The machine will also become
unresponsive transiently when running fsck in domU on a filesystem
that is a loopback device mounted over NFS.
> It''s worth checking the Dell site to make sure you have the latest
> megaraid firmware and driver.
Running native mainline 2.6.11.10 NFS transfers don''t cause any
problems. To reduce the possibility of it being a benchmark-like SUE
I''ll do a clean build from scratch of the dom0 kernel.


        -Kip

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I just updated to 2.0.6. Large NFS transfers work fine with the
default configuration. If xend has been started (i.e. the bridge has
been configured) the machine will become unresponsive when copying a
large file over NFS.

I''ll just skip migration testing for now.

        -Kip



On 5/21/05, Kip Macy <kip.macy@gmail.com> wrote:
>  > It sounds like the megaraid driver is unhappy. Can you reproduce this
> > copying the file to /dev/null?
> 
> I think it was unhappy because its interrupts weren''t being
serviced.
> Copying /home/kmacy/suseroot.0 to /home/kmacy/suseroot.1 (NFS -> NFS)
> locks the machine up just fine. The machine will also become
> unresponsive transiently when running fsck in domU on a filesystem
> that is a loopback device mounted over NFS.
> 
> > It''s worth checking the Dell site to make sure you have the
latest
> > megaraid firmware and driver.
> 
> Running native mainline 2.6.11.10 NFS transfers don''t cause any
> problems. To reduce the possibility of it being a benchmark-like SUE
> I''ll do a clean build from scratch of the dom0 kernel.
> 
> 
>         -Kip
>
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No bridge helps with NFS, but I just tried scp on a freshly re-booted
machine and it locked up instantly. Booting into Centos4 SMP and the
scp works fine - if this a SUE it is a particularly inventive one.

I guess it is time to move to the server room and cross my fingers
that this is a 100Mbit issue.

         -Kip


On 5/22/05, Kip Macy <kip.macy@gmail.com> wrote:
> I just updated to 2.0.6. Large NFS transfers work fine with the
> default configuration. If xend has been started (i.e. the bridge has
> been configured) the machine will become unresponsive when copying a
> large file over NFS.
> 
> I''ll just skip migration testing for now.
> 
>         -Kip
> 
> 
> 
> On 5/21/05, Kip Macy <kip.macy@gmail.com> wrote:
> >  > It sounds like the megaraid driver is unhappy. Can you reproduce
this
> > > copying the file to /dev/null?
> >
> > I think it was unhappy because its interrupts weren''t being
serviced.
> > Copying /home/kmacy/suseroot.0 to /home/kmacy/suseroot.1 (NFS ->
NFS)
> > locks the machine up just fine. The machine will also become
> > unresponsive transiently when running fsck in domU on a filesystem
> > that is a loopback device mounted over NFS.
> >
> > > It''s worth checking the Dell site to make sure you have
the latest
> > > megaraid firmware and driver.
> >
> > Running native mainline 2.6.11.10 NFS transfers don''t cause
any
> > problems. To reduce the possibility of it being a benchmark-like SUE
> > I''ll do a clean build from scratch of the dom0 kernel.
> >
> >
> >         -Kip
> >
>
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