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Date: Tue, 11 Nov 2008 16:43:24 +0200
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under
	heavy load.
Message-ID: <20081111144324.GE20617@redhat.com>
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Paul Brook <paul@codesourcery.com>, qemu-devel@nongnu.org

On Mon, Nov 10, 2008 at 09:46:12AM -0600, Anthony Liguori wrote:
> Gleb Natapov wrote:
>> On Mon, Nov 10, 2008 at 09:24:55AM -0600, Anthony Liguori wrote:
>>   
>>> Gleb Natapov wrote:
>>>     
>>>> On Sun, Nov 09, 2008 at 10:36:59AM -0600, Anthony Liguori wrote:
>>>>   
>>>>
>>>>       
>>>>> Otherwise, I'm curious if you have any insight into where we're  
>>>>> pausing  for 10ms that's causing the missed interrupt?
>>>>>
>>>>>             
>>>> Don't know yet.
>>>>         
>>> What's your full command line?
>>>
>>>     
>> /home/gleb/install/qemu/org/bin/qemu-system-x86_64 -hda Windows2003.raw -m 1024 -net
>> nic,model=rtl8139 -net user -vnc 172.17.10.111:1 -usbdevice tablet
>>   
>
> -usbdevice tablet may be the culprit.  Is the guest doing an significant IO?
>
-usbdevice tablet has nothing to do with it. Qemu misses interrupt even
without this option and with SDL screen it misses them in bunches when
SDL redraws a screen. In case of vnc qemu misses interrupt because of
fsync() call in raw_flush(), or so my instrumentation shows.

--
			Gleb.