From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: [PATCH 18/21] Remove host_alarm_timer hacks. Date: Thu, 30 Apr 2009 10:49:20 -0500 Message-ID: <49F9C880.3080802@us.ibm.com> References: <1241040038-17183-1-git-send-email-aliguori@us.ibm.com> <1241040038-17183-19-git-send-email-aliguori@us.ibm.com> <49F972EB.3040208@redhat.com> <49F9A56C.5000705@us.ibm.com> <49F9A6BA.5040702@redhat.com> <49F9A97D.7050004@us.ibm.com> <49F9C7BB.1080908@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Avi Kivity Return-path: Received: from e34.co.us.ibm.com ([32.97.110.152]:54040 "EHLO e34.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933062AbZD3Pth (ORCPT ); Thu, 30 Apr 2009 11:49:37 -0400 Received: from d03relay02.boulder.ibm.com (d03relay02.boulder.ibm.com [9.17.195.227]) by e34.co.us.ibm.com (8.13.1/8.13.1) with ESMTP id n3UFl70O021338 for ; Thu, 30 Apr 2009 09:47:07 -0600 Received: from d03av03.boulder.ibm.com (d03av03.boulder.ibm.com [9.17.195.169]) by d03relay02.boulder.ibm.com (8.13.8/8.13.8/NCO v9.2) with ESMTP id n3UFnVgL038032 for ; Thu, 30 Apr 2009 09:49:32 -0600 Received: from d03av03.boulder.ibm.com (loopback [127.0.0.1]) by d03av03.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id n3UFnLNv026898 for ; Thu, 30 Apr 2009 09:49:21 -0600 In-Reply-To: <49F9C7BB.1080908@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Avi Kivity wrote: >> >> Do we really care about optimizing latency with -clock rtc though? >> > > People still run kvm on RHEL 5 (or cheap clones thereof), aren't they > affected? Do they use -clock rtc? -clock dynticks should still work on RHEL 5 it's just that you won't get very accurate timer events. You can only use -clock rtc with a single guest at a time so I doubt people use it seriously. The other option would be -clock unix but I can't see why you'd use -clock unix instead of -clock dynticks. The only reason to keep -clock unix around is for non Linux unices. -- Regards, Anthony Liguori