From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Tokarev <mjt@tls.msk.ru>
Subject: Re: [Qemu-devel] TSC in qem[-kvm] 1.1+ and in-kernel irqchip
Date: Mon, 13 Aug 2012 17:16:22 +0400
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References: <5024011F.2020200@msgid.tls.msk.ru> <20120810073346.GD24410@redhat.com> <5024D336.5090108@msgid.tls.msk.ru> <20120812081038.GJ3341@redhat.com> <50277631.2080808@msgid.tls.msk.ru> <5028FC02.4090205@siemens.com>
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Cc: Avi Kivity <avi@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>,
	KVM list <kvm@vger.kernel.org>, Gleb Natapov <gleb@redhat.com>,
	qemu-devel <qemu-devel@nongnu.org>
To: Jan Kiszka <jan.kiszka@siemens.com>
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On 13.08.2012 17:07, Jan Kiszka wrote:
[]
>> The bisecion leads to this commit:
>>
>> commit 17ee47418e65b1593defb30edbab33ccd47fc1f8
>> Merge: 13b0496 5d17c0d
>> Author: Jan Kiszka <jan.kiszka@siemens.com>
>> Date:   Tue Apr 10 16:26:23 2012 +0200
>>
>>     Merge commit '5d17c0d2df4998598e6002b27b8e47e792899a0f' into queues/qemu-merge
[]
>> Cc'ing Jan for help.  The short story: tsc timer calibration
>> broke in 1.1+ with in-kernel irqchip (only) for several
>> apps (seabios and grub are two examples), the time is ticking
>> about 100 times faster.  In grub the timer is calibrated
>> using pit.  The above commit is the result of bisection.
> 
> Did the versions you tested include the commit 0cdd3d1444 (kvm: i8254:
> Fix conversion of in-kernel to userspace state)?

While bisecting I didn't have this commit applied, since it were
applied past (qemu)-1.1.  It is included into qemu-kvm 1.1.0
(as 960d355dc60d9), and that version behaves _exactly_ the same -
the time in grub is ticking 100 times faster.  I mentioned in this
thread that the problem persists in current qemu (and qemu-kvm)
git too.

I can repeat the bisection with this commit applied after the
above "bad" commit.  Should I?

Thanks,

/mjt