From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Cc: Michael Tokarev <mjt@tls.msk.ru>, KVM list <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] net packet storms with multiple NICs
Date: Wed, 11 Nov 2009 01:19:18 +0000 [thread overview]
Message-ID: <200911110119.18839.paul@codesourcery.com> (raw)
In-Reply-To: <4AE1D903.5030709@msgid.tls.msk.ru>
> I immediately reproduced the problem locally. It turns out that
> kvm reflects packets coming from one guest NIC on another guest
> NIC, and since both are connected to the same bridge we're getting
> endless packet storm. To a level when kvm process becomes 100%
> busy and does not respond to anything but `kill -9'.
You created a network loop. It is working exactly as expected.
Create the same topology with a physical network hub and a pair of NICs and
you'll get the same end result.
Paul
next prev parent reply other threads:[~2009-11-11 1:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-23 16:25 [Qemu-devel] net packet storms with multiple NICs Michael Tokarev
2009-10-23 16:33 ` [Qemu-devel] " Andreas Plesner Jacobsen
2009-10-23 16:57 ` Michael Tokarev
2009-10-23 16:43 ` [Qemu-devel] " Mark McLoughlin
2009-10-25 14:22 ` Avi Kivity
2009-10-26 13:40 ` Krumme, Chris
2009-10-26 13:44 ` Avi Kivity
2009-11-11 1:38 ` Anthony Liguori
2009-11-11 1:19 ` Paul Brook [this message]
2009-11-11 9:23 ` Michael Tokarev
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200911110119.18839.paul@codesourcery.com \
--to=paul@codesourcery.com \
--cc=kvm@vger.kernel.org \
--cc=mjt@tls.msk.ru \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).