From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sheng Yang <sheng@linux.intel.com>
Subject: Re: KVM Test report, kernel e6a9246... qemu 94f964d...
Date: Wed, 8 Sep 2010 08:35:14 +0800
Message-ID: <201009080835.14800.sheng@linux.intel.com>
References: <BC00F5384FCFC9499AF06F92E8B78A9E183AEA6564@shsmsx502.ccr.corp.intel.com> <4C8630A2.9040706@redhat.com> <4C863CD1.7020501@redhat.com>
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Cc: kvm@vger.kernel.org, "Hao, Xudong" <xudong.hao@intel.com>
To: Avi Kivity <avi@redhat.com>
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On Tuesday 07 September 2010 21:23:29 Avi Kivity wrote:
>   On 09/07/2010 03:31 PM, Avi Kivity wrote:
> >  On 09/07/2010 03:04 PM, Avi Kivity wrote:
> >>  On 09/07/2010 02:27 PM, Avi Kivity wrote:
> >>>  On 09/07/2010 11:54 AM, Sheng Yang wrote:
> >>>> BTW: the bad commit is: c94c3ba901f87115cf574044e7faabfb1d0251fb
> >>>> "KVM: Don't
> >>>> save/restore MSR_IA32_PERF_STATUS", but I haven't figured out the
> >>>> reason yet.
> >>> 
> >>> Confirmed.  Strange!
> >> 
> >> It's incredibly slow.  Did we disable the cpu cache somehow?  Maybe
> >> through the page tables?
> > 
> > PAT = 0.

Quite impressive!
 
> Patch posted - qemu didn't reset PAT correctly, but this worked before
> c94c3ba90 since setting MSR_IA32_PERF_STATUS failed (and qemu didn't
> check the error code).

Thanks!

--
regards
Yang, Sheng