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Re: [Xen-devel] copying large files over NFS locks up machine on -testing from Thursday

  • To: Chris Wright <chrisw@xxxxxxxx>
  • From: Kip Macy <kip.macy@xxxxxxxxx>
  • Date: Sat, 21 May 2005 14:41:48 -0700
  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Sat, 21 May 2005 21:41:14 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

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 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


On 5/21/05, Chris Wright <chrisw@xxxxxxxx> wrote:
> * Kip Macy (kip.macy@xxxxxxxxx) 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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