From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@qumranet.com>
Subject: Re: [patch 00/12] fake ACPI C2 emulation v2
Date: Thu, 05 Jun 2008 10:56:21 +0300
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Cc: Chris Wright <chrisw@redhat.com>,
	Glauber Costa <gcosta@redhat.com>,
	Anthony Liguori <aliguori@us.ibm.com>, kvm@vger.kernel.org
To: Marcelo Tosatti <mtosatti@redhat.com>
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Marcelo Tosatti wrote:
> On Wed, Jun 04, 2008 at 01:49:41PM +0300, Avi Kivity wrote:
>   
>>> Test is 1 million gettimeofday calls, Xeon 1.60GHz with 4MB L2.
>>>
>>> guest (qemu emulation):
>>> cycles:1189759332
>>>
>>> guest (in-kernel emulation):
>>> cycles:628046412
>>>
>>> guest (direct pmtimer):
>>> cycles:230372934
>>>
>>> host (TSC):
>>> cycles:14862774
>>>
>>>       
>> Ratio is 1:15:80
>>
>> Looks like direct pmtimer is still quite slow. Are there any exits with 
>> direct pmtimer, or is it all due to the ioport latency?
>>     
>
> host (pmtimer):
> cycles:225768390
>
> So its getting close-to-native performance. As you mentioned earlier,
> acpi_pm can't benefit from vsyscalls.
>
>   

Yes, but the host will use tsc (on a modern host with a stable tsc).

-- 
error compiling committee.c: too many arguments to function