From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: KVM Test report, kernel e6a9246... qemu 94f964d... Date: Tue, 07 Sep 2010 16:23:29 +0300 Message-ID: <4C863CD1.7020501@redhat.com> References: <4C85F489.306@redhat.com> <201009071654.26156.sheng@linux.intel.com> <4C8621A4.6040805@redhat.com> <4C862A4C.8080002@redhat.com> <4C8630A2.9040706@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org, "Hao, Xudong" To: Sheng Yang Return-path: Received: from mx1.redhat.com ([209.132.183.28]:30218 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751657Ab0IGNXe (ORCPT ); Tue, 7 Sep 2010 09:23:34 -0400 In-Reply-To: <4C8630A2.9040706@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: 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. > 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). -- error compiling committee.c: too many arguments to function