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

I''ve locked up my dom0 a couple of times this morning copying a 3GB
file from local disk to an NFS mount(neither xend nor guests running).
I don''t encounter this problem on the stock CentOS 4 kernel. The
machine is a PowerEdge 2850 with 2 e1000 cards - the one in use is
connected to a PowerConnect 2216 10/100 switch and has negotiated
100Mbit. I''ll check if the stock Cambridge isn''t negotiating
full
duplex but that shouldn''t cause lockups.

My mount options are:
defaults,intr,rsize=32768,wsize=32768,nfsvers=3,tcp,timeo=600

This isn''t at NetApp (no 100Mbit there), but these are the options
used by all their linux NFS clients.

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Does it happen only when using the bridge?

robert

On May 21, 2005, at 11:06, Kip Macy wrote:
> I''ve locked up my dom0 a couple of times this morning copying a
3GB
> file from local disk to an NFS mount(neither xend nor guests running).
> I don''t encounter this problem on the stock CentOS 4 kernel. The
> machine is a PowerEdge 2850 with 2 e1000 cards - the one in use is
> connected to a PowerConnect 2216 10/100 switch and has negotiated
> 100Mbit. I''ll check if the stock Cambridge isn''t
negotiating full
> duplex but that shouldn''t cause lockups.
>
> My mount options are:
> defaults,intr,rsize=32768,wsize=32768,nfsvers=3,tcp,timeo=600
>
> This isn''t at NetApp (no 100Mbit there), but these are the options
> used by all their linux NFS clients.
>
>
--
Robert Read
robert@xensource.com



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* Kip Macy (kip.macy@gmail.com) wrote:
> I''ve locked up my dom0 a couple of times this morning copying a
3GB
> file from local disk to an NFS mount(neither xend nor guests running).
> I don''t encounter this problem on the stock CentOS 4 kernel. The
> machine is a PowerEdge 2850 with 2 e1000 cards - the one in use is
> connected to a PowerConnect 2216 10/100 switch and has negotiated
> 100Mbit. I''ll check if the stock Cambridge isn''t
negotiating full
> duplex but that shouldn''t cause lockups.
> 
> My mount options are:
> defaults,intr,rsize=32768,wsize=32768,nfsvers=3,tcp,timeo=600
Hmm, I''ve seen this on stock 2.6.11 kernels as well (no xen).  Any
chance
you can get useful debugging out it?

thanks,
-chris

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If it happens on -unstable in domUs (it probably does) I can grab a
coredump or attach to it while it is running and see where it is
wedged. I don''t have a port master where I''m at so I
can''t use pdb or
cdb.

      -Kip


On 5/21/05, Chris Wright <chrisw@osdl.org> wrote:
> * Kip Macy (kip.macy@gmail.com) wrote:
> > I''ve locked up my dom0 a couple of times this morning copying
a 3GB
> > file from local disk to an NFS mount(neither xend nor guests running).
> > I don''t encounter this problem on the stock CentOS 4 kernel.
The
> > machine is a PowerEdge 2850 with 2 e1000 cards - the one in use is
> > connected to a PowerConnect 2216 10/100 switch and has negotiated
> > 100Mbit. I''ll check if the stock Cambridge isn''t
negotiating full
> > duplex but that shouldn''t cause lockups.
> >
> > My mount options are:
> > defaults,intr,rsize=32768,wsize=32768,nfsvers=3,tcp,timeo=600
> 
> Hmm, I''ve seen this on stock 2.6.11 kernels as well (no xen).  Any
chance
> you can get useful debugging out it?
> 
> thanks,
> -chris
>
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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.

I''ll try building a stock linux 2.6.11.10 kernel with the same non-xen
options as the Cambridge kernel to see if it has the same issues.
After that I''ll just stick to having everything on local disk until I
get moved to a GigE network at which point I can start testing
migration.



        -Kip


On 5/21/05, Chris Wright <chrisw@osdl.org> wrote:
> * Kip Macy (kip.macy@gmail.com) wrote:
> > I''ve locked up my dom0 a couple of times this morning copying
a 3GB
> > file from local disk to an NFS mount(neither xend nor guests running).
> > I don''t encounter this problem on the stock CentOS 4 kernel.
The
> > machine is a PowerEdge 2850 with 2 e1000 cards - the one in use is
> > connected to a PowerConnect 2216 10/100 switch and has negotiated
> > 100Mbit. I''ll check if the stock Cambridge isn''t
negotiating full
> > duplex but that shouldn''t cause lockups.
> >
> > My mount options are:
> > defaults,intr,rsize=32768,wsize=32768,nfsvers=3,tcp,timeo=600
> 
> Hmm, I''ve seen this on stock 2.6.11 kernels as well (no xen).  Any
chance
> you can get useful debugging out it?
> 
> thanks,
> -chris
>
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It appears to be isolated to Cambridge''s 2.6.11.10 - I just built an
unmodified 2.6.11.10 and copied the 3GB file over NFS without issue.
I''m 5 for 5 locking up -testing''s 2.6.11.10 so I think it
isn''t an
issue with mainline.

     -Kip

On 5/21/05, Kip Macy <kip.macy@gmail.com> wrote:
> 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.
> 
> I''ll try building a stock linux 2.6.11.10 kernel with the same
non-xen
> options as the Cambridge kernel to see if it has the same issues.
> After that I''ll just stick to having everything on local disk
until I
> get moved to a GigE network at which point I can start testing
> migration.
> 
> 
> 
>         -Kip
> 
> 
> On 5/21/05, Chris Wright <chrisw@osdl.org> wrote:
> > * Kip Macy (kip.macy@gmail.com) wrote:
> > > I''ve locked up my dom0 a couple of times this morning
copying a 3GB
> > > file from local disk to an NFS mount(neither xend nor guests
running).
> > > I don''t encounter this problem on the stock CentOS 4
kernel. The
> > > machine is a PowerEdge 2850 with 2 e1000 cards - the one in use
is
> > > connected to a PowerConnect 2216 10/100 switch and has negotiated
> > > 100Mbit. I''ll check if the stock Cambridge
isn''t negotiating full
> > > duplex but that shouldn''t cause lockups.
> > >
> > > My mount options are:
> > > defaults,intr,rsize=32768,wsize=32768,nfsvers=3,tcp,timeo=600
> >
> > Hmm, I''ve seen this on stock 2.6.11 kernels as well (no xen).
Any chance
> > you can get useful debugging out it?
> >
> > thanks,
> > -chris
> >
>
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