From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: KVM got slow after adding more physical memory to host Date: Tue, 06 Sep 2011 20:01:47 +0300 Message-ID: <4E6651FB.3050208@redhat.com> References: <20110906140201.GF18218@pcnci.linuxbox.cz> <4E663897.60901@redhat.com> <20110906153801.GA2152@nik-comp.lan> <4E664036.20308@redhat.com> <20110906160113.GB2152@nik-comp.lan> <4E66450A.8070302@redhat.com> <20110906161045.GL26451@redhat.com> <20110906163029.GC2152@nik-comp.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Gleb Natapov , kvm@vger.kernel.org To: Nikola Ciprich Return-path: Received: from mx1.redhat.com ([209.132.183.28]:48055 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752683Ab1IFR3l (ORCPT ); Tue, 6 Sep 2011 13:29:41 -0400 In-Reply-To: <20110906163029.GC2152@nik-comp.lan> Sender: kvm-owner@vger.kernel.org List-ID: On 09/06/2011 07:30 PM, Nikola Ciprich wrote: > OK, seems like Avi's right, at least the windows guest is not using DMA > though the question is, why did it got disabled It can happen due to a timeout, perhaps a temporary load spike. > and how can I reenable it, Google knows. > I'm not experienced that much with XP :( > > > > It is rep/in-out. But why it became noticeable only after adding more > > physical memory to the host is a mystery. > > now that I'm thinking about it, we had similar problem in the past, the windows guest > was unusably slow, and the whole host was slow as well... upgrading to 0.14.1 seemingly > solved this issue, but maybe the DMA just got randomly enabled, and now after adding > the memory (and restarting of course), it just got disabled again? > but why could this be?? > I don't think it's related to the memory. -- error compiling committee.c: too many arguments to function