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From: Mark McLoughlin <markmc@redhat.com>
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Date: Wed, 11 Feb 2009 20:19:01 +0000
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Subject: [Qemu-devel] Re: [PATCH 0/4] qemu: TAP filtering support
Reply-To: Mark McLoughlin <markmc@redhat.com>, qemu-devel@nongnu.org
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To: Alex Williamson <alex.williamson@hp.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org

On Wed, 2009-02-11 at 12:51 -0700, Alex Williamson wrote:
> >   - What do we need rxfilter=on|off on the command line for?
> 
> Primarily because the current tun driver in Linux has a bug that it can
> drop unicast packets requested to be included in the filter if it
> overflows the exact match table.
> 
> http://www.spinics.net/lists/netdev/msg88451.html

Oh dear. Does this suggest we should make rxfilter=off the default?

Is there any way we can automatically detect we're running on a broken
kernel?

Thanks,
Mark.