Re: [Qemu-devel] Re: qemu-kvm guest network stalls

[William King <quentusrex@gmail.com>]

Thanks for the reply Stefan.

That looks to be exactly the same bug I'm dealing with here. The one
difference is that I can reproduce it easily on test hardware. So I have
two separate boxes that can go down(and run test code) without
interfering with anything in production.

My test setup has a local torrent server, and 5 other machines on the
network seeding a very large(10GB) random data file that I created. When
the guest tries to download this file from the other servers this
aggravates the issue. To the point that I could cause it to fail within
minutes, repeatedly. I created this test after someone on irc said that
the issue could have something to do with udp traffic rather than tcp
traffic.

I am running latest ubuntu 10.04 on the hosts and the guests, and I can
wipe(and reinstall) the hosts quickly and easily.

On 06/28/2010 01:28 AM, Stefan Hajnoczi wrote:
> On Mon, Jun 28, 2010 at 9:08 AM, William King <quentusrex@gmail.com> wrote:
>> Is this the wrong list to get help tracking down why the network stalls
>> under heavy load?
> 
> This list is the right one.  There is at least one known network stall bug:
> 
> http://sourceforge.net/tracker/?func=detail&atid=893831&aid=2506814&group_id=180599
> http://www.mail-archive.com/kvm@vger.kernel.org/msg06774.html
> 
> I sounds like you have the same issue?
> 
> Stefan