From: Michael Tokarev <mjt@tls.msk.ru>
To: Peter Lieven <pl@dlh.net>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] Re: irq problems after live migration with 0.12.4
Date: Tue, 25 May 2010 23:27:16 +0400 [thread overview]
Message-ID: <4BFC2494.7010305@msgid.tls.msk.ru> (raw)
In-Reply-To: <4BFBAE6D.4010507@dlh.net>
25.05.2010 15:03, Peter Lieven wrote:
> Michael Tokarev wrote:
>> 23.05.2010 13:55, Peter Lieven wrote:
[]
>>> [64442.298521] irq 10: nobody cared (try booting with the "irqpoll" option)
[]
>>> [64442.299433] handlers:
>>> [64442.299840] [<ffffffffa0000b80>] (e1000_intr+0x0/0x190 [e1000])
>>> [64442.300046] Disabling IRQ #10
Apparently, for some reason, e1000_intr decided it's not
interesting IRQ or somehow wrong or not for that NIC. I
dunno. But something fishy is going on with IRQs here.
>> See also LP bug #584131 (https://bugs.launchpad.net/bugs/584131)
>> and original Debian bug#580649 (http://bugs.debian.org/580649)
>> Not sure if they're related...
It looks they are actually the same thing, but happens with
different devices and/or IRQs. Either spurious, or unwanted,
or unrecognized or somesuch IRQ which is not recognized by
the irq handler, which results in disabling that IRQ by the
kernel, which is a bad thing (In your case it works because
e1000 works in 2 modes, interrupts and polling).
> michael, do you have any ideas what i got do to debug whats happening?
Unfortunately, no idea. I don't know neither kernel nor kvm
internals.
> looking at launchpad and debian bug tracker i found other bugs also
> with a maybe related problem. so this issue might be greater...
Can you share your findings? I don't know other debian bugs which
are similar to this one.
Thanks!
/mjt
next prev parent reply other threads:[~2010-05-25 19:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-23 9:55 irq problems after live migration with 0.12.4 Peter Lieven
2010-05-23 9:55 ` [Qemu-devel] " Peter Lieven
2010-05-23 10:38 ` Michael Tokarev
2010-05-23 10:38 ` [Qemu-devel] " Michael Tokarev
2010-05-23 10:44 ` Peter Lieven
2010-05-25 11:03 ` Peter Lieven
2010-05-25 19:27 ` Michael Tokarev [this message]
2010-05-26 11:47 ` Peter Lieven
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