Re: FW: [Xen-users] Problem with Dell Poweredge 1850

To:	Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>
Subject:	Re: FW: [Xen-users] Problem with Dell Poweredge 1850
From:	David H <davidh.davidh@xxxxxxxxx>
Date:	Fri, 27 May 2005 08:55:39 -0700
Cc:	"Gino LV. Ledesma" <gledesma@xxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
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Reply-to:	David H <davidh.davidh@xxxxxxxxx>
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> It would be particularly interesting to know what the unstable tree does
> on these systems, as the code is quite different.

I may not have been clear; I have been testing with "unstable".  If I
build unstable with the default configuration and boot dom0 with the
following grub entry I can make dom0 hang using a number of IO
intensive commands.  Tar, cp, mkfs, all can cause the problem and
using scp to copy a large file to another machine will hang the domain
in no time.  Xen still responds on the serial console.

title Xen 2.0.6 / XenLinux 2.6.11
        root (hd0,0)
        kernel /xen.gz dom0_mem=131072 console=com1 watchdog com1=115200,8n1
        module /vmlinuz-2.6.11-xen0 root=/dev/VolGroup00/LogVol00 ro
console=tty0
        module /initrd-xen-2.0.img   

Add "nousb"
module /vmlinuz-2.6.11-xen0 root=/dev/VolGroup00/LogVol00 ro console=tty0 nousb
and the problem goes away.

David

On 5/27/05, Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx> wrote:
> 
> > After a few day of off and on testing it would appear that
> > adding "nousb" to the 2.6 kernel boot options in the grub
> > config fixes this problem.  I have tested with the last few
> > days of unstable builds without a hang.  I have no idea why
> > this works but, so far it does.  I have not had a chance to
> > test much with 2.0.6 so I can't say for sure if the same
> > holds true there.
> 
> Interesting. This might turn out just to be a differnce in kernel config
> between the xen and native kernels you've tried. It might be interesting
> to compile up a stock 2.6.11.10 native kernel with a config as close as
> possible to the xen0 one, and see if the same problem is exhibited.
> 
> Also, if there are any USB options in the BIOS (e.g. legacy support) it
> might be interesting to know if they have any effect.
> 
> It would be particularly interesting to know what the unstable tree does
> on these systems, as the code is quite different.
> 
> Best,
> Ian
>

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