From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rik van Riel Subject: Re: Swap usage with KVM Date: Mon, 02 Aug 2010 15:31:47 -0400 Message-ID: <4C571D23.3040802@redhat.com> References: <20100711151257.GA13279@defiant.freesoftware> <20100711191227.GD9267@defiant.freesoftware> <4C3A3C77.2010408@redhat.com> <20100802185705.GJ21963@defiant.freesoftware> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit To: dbareiro@gmx.net, KVM General , "hugh.dickins@tiscali.co.uk" Return-path: Received: from mx1.redhat.com ([209.132.183.28]:4475 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751303Ab0HBTb4 (ORCPT ); Mon, 2 Aug 2010 15:31:56 -0400 In-Reply-To: <20100802185705.GJ21963@defiant.freesoftware> Sender: kvm-owner@vger.kernel.org List-ID: On 08/02/2010 02:57 PM, Daniel Bareiro wrote: > Hi, Rik. > > On Sunday, 11 July 2010 17:49:43 -0400, > Rik van Riel wrote: > >>>> I have an installation with Debian GNU/Linux 5.0.4 amd64 with >>>> qemu-kvm 0.12.3 compiled with the source code obtained from the >>>> official site of KVM and Linux 2.6.32.12 compiled from source code >>>> of kernel.org. All this is installed on an HP Proliant DL380 G6 with >>>> two Xeon E5530 quadcore processors and 16 GiB of RAM which has two >>>> VMs with the following configuration of memory: >>>> >>>> Hostname | RAM >>>> ===============+=============== >>>> Aps4 | 7 GiB >>>> Leela | 7 GiB >>>> ===============+=============== >>>> TOTAL | 14 GiB >>>> >>>> Initially the host was created with a swap partition of 1 GiB, but >>>> today we found that the use of swap quickly began to grow >>>> increasingly. Therefore, as a contingency, we had to hot-add a >>>> logical volume of 1 GB of swap on the VMHost. Is 'normal' this use >>>> of memory? > >> That depends on what is going on in the host. >> >> Did you notice any performance issues in the guest when you started >> using swap? > > After the logical volume of 1 GB that I added when I found this problem > (being the operating system with 2 GB), I added other 3 GB to have a > little more margin, but today I got again a new alert of Nagios: > > > Swap usage WARNING [...] SWAP WARNING - 30% free (1490 MB out of 5052 MB) > > > I don't see performance issue in the VMs. > > Marcelo Tosatti recommended me to apply the EPT patch > (6316e1c8c6af6ccb55ff8564231710660608f46c). Should it be safe for use in > production? Are there plans that this patch is applied on some version > of Linux stable? Yes, that patch is safe and definitely recommended. -- All rights reversed