From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vadim Rozenfeld Subject: Re: Performance issue Date: Tue, 27 Nov 2012 22:38:38 +0200 Message-ID: <201211272238.38614.vrozenfe@redhat.com> References: <20121127145447.GJ12969@redhat.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: "George-Cristian =?utf-8?q?B=C3=AErzan?=" , kvm@vger.kernel.org To: Gleb Natapov Return-path: Received: from mx1.redhat.com ([209.132.183.28]:55977 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756624Ab2K0Uip convert rfc822-to-8bit (ORCPT ); Tue, 27 Nov 2012 15:38:45 -0500 In-Reply-To: <20121127145447.GJ12969@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On Tuesday, November 27, 2012 04:54:47 PM Gleb Natapov wrote: > On Tue, Nov 27, 2012 at 02:29:20PM +0200, George-Cristian B=C3=AErzan= wrote: > > On Tue, Nov 27, 2012 at 2:20 PM, Gleb Natapov wro= te: > > > On Mon, Nov 26, 2012 at 09:31:19PM +0200, George-Cristian B=C3=AE= rzan wrote: > > >> On Sun, Nov 25, 2012 at 6:17 PM, George-Cristian B=C3=AErzan =20 wrote: > > >> > On Sun, Nov 25, 2012 at 5:19 PM, Gleb Natapov =20 wrote: > > >> >> What Windows is this? Can you try changing "-cpu host" to "-c= pu > > >> >> host,+hv_relaxed"? > > >> >=20 > > >> > This is on Windows Server 2008 R2 (sorry, forgot to mention th= at I > > >> > guess), and I can try it tomorrow (US time), as getting a stre= am my > > >> > way depends on complicated stuff. I will though, and let you k= now > > >> > how it goes. > > >>=20 > > >> I changed that, no difference. > > >=20 > > > Heh, I forgot that the part that should make difference is not ye= t > > > upstream :( > >=20 > > We can try recompiling kvm/qemu with some patches, if that'd help. = At > > this point, anything is on the table except changing Windows and th= e > > hardware :-) >=20 > Vadim do you have Hyper-v reference timer patches for KVM to try? I have some code which do both reference time and invariant TSC but it will not work after migration. I will send it later today. Vadim. >=20 > > Also, it might be that the software doing the actual work is not we= ll > > written, but even so... > >=20 > > -- > > George-Cristian B=C3=AErzan >=20 > -- > Gleb.