From: Blue Swirl <blauwirbel@gmail.com>
To: Paul Brook <paul@codesourcery.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] How to lock-up your tap-based VM network
Date: Tue, 13 Apr 2010 22:13:50 +0300 [thread overview]
Message-ID: <k2zf43fc5581004131213q575798cq69d0dde8b4050d7@mail.gmail.com> (raw)
In-Reply-To: <x2of43fc5581004131148p9f1c3c3dm7d50231b50f374f0@mail.gmail.com>
On 4/13/10, Blue Swirl <blauwirbel@gmail.com> wrote:
> On 4/12/10, Paul Brook <paul@codesourcery.com> wrote:
> > > A major reason for this deadlock could likely be removed by shutting
> > > down the tap (if peered) or dropping packets in user space (in case of
> > > vlan) when a NIC is stopped or otherwise shut down. Currently most (if
> > > not all) NIC models seem to signal both "queue full" and "RX disabled"
> > > via !can_receive().
> >
> >
> > No. A disabled device should return true from can_recieve, then discard the
> > packets in its receive callback. Failure to do so is a bug in the device. It
> > looks like the virtio-net device may be buggy.
>
>
> Awesome, it looks like a longstanding bug with pcnet/lance has is
> fixed by this change! OpenBSD installer would hang when receiving
> packages, now it works!
I spoke too soon, networking works also without the patch now.
prev parent reply other threads:[~2010-04-13 19:13 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-12 16:43 [Qemu-devel] How to lock-up your tap-based VM network Jan Kiszka
2010-04-12 20:07 ` Paul Brook
2010-04-12 21:49 ` Jamie Lokier
2010-04-12 23:20 ` Paul Brook
2010-04-13 12:30 ` Jan Kiszka
2010-04-13 13:02 ` Paul Brook
2010-04-13 12:22 ` Jan Kiszka
2010-04-13 12:19 ` Jan Kiszka
2010-04-13 13:03 ` Paul Brook
2010-04-13 13:15 ` Jan Kiszka
2010-04-13 18:48 ` Blue Swirl
2010-04-13 19:13 ` Blue Swirl [this message]
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