From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Bareiro Subject: Re: Swap usage with KVM Date: Sun, 11 Jul 2010 19:08:58 -0300 Message-ID: <20100711220858.GE9267@defiant.freesoftware> References: <20100711151257.GA13279@defiant.freesoftware> Reply-To: dbareiro@gmx.net Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Q0rSlbzrZN6k9QnT" To: KVM General Return-path: Received: from mail.gmx.net ([213.165.64.20]:52801 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751202Ab0GKWJH (ORCPT ); Sun, 11 Jul 2010 18:09:07 -0400 Received: from defiant (defiant.freesoftware [10.1.0.65]) by hermes.freesoftware (Postfix) with ESMTP id B146B62C for ; Sun, 11 Jul 2010 19:06:58 -0300 (ART) Content-Disposition: inline In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: --Q0rSlbzrZN6k9QnT Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi, Freddie. On Sunday, 11 July 2010 14:05:38 -0700, Freddie Cash 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: > Are you using virtio drivers in the VMs? >=20 > There was an issue with KVM-72 and virtio that leaks memory in the > host until all RAM and swap is used (inside the VMs, no swap is used). > It was supposed to be fixed in KVM-80-something, though. >=20 > Perhaps something similar is happening again? If you switch the disks > to scsi instead of virtio, does the problem go away? >=20 > We are running KVM-72 on Debian 5.0 and have run into this issue. > We'll be upgrading our hosts this month to fix this. Yes, we are using Virtio drivers for networking and storage in both VMs with cache=3Dnone. Both VMs are running Linux 2.6.32-bpo.5-amd64 from Lenny Backports repositories. For VMHost, we are using a stable version of KVM with Linux 2.6.32.12 compiled from source code of kernel.org and qemu-kvm 0.12.3 compiled with the source code obtained from the official site of KVM. This is the syntax I'm using to boot the virtual machines: 8587 ? Sl 6515:25 /usr/local/qemu-kvm/bin/qemu-system-x86_64 -dri= ve file=3D/dev/vm/aps4-raiz,cache=3Dnone,if=3Dvirtio,boot=3Don -drive file=3D/dev/vm/aps4-cache,cache=3Dnone,if=3Dvirtio -drive file=3D/dev/vm/ap= s4-index,cache=3Dnone,if=3Dvirtio -drive file=3D/dev/vm/aps4-space,cache=3Dnone,if=3Dvirtio -m 7168 -smp 4 -n= et nic,model=3Dvirtio,macaddr=3D00:16:3e:00:00:95 -net tap -daemonize -vnc :3 = -k es -localtime -monitor telnet:localhost:4003,server,nowait -serial telnet:localhost:4043,server,no= wait 9769 ? Rl 11968:47 /usr/local/qemu-kvm/bin/qemu-system-x86_64 -dr= ive file=3D/dev/vm/leela-raiz,cache=3Dnone,if=3Dvirtio,boot=3Don -drive file=3D/dev/vm/leela-u01,cache=3Dnone,if=3Dvirtio -drive file=3D/dev/vm/lee= la-u02,cache=3Dnone,if=3Dvirtio -drive file=3D/dev/vm/leela-u03,cache=3Dnone,if=3Dvirtio -drive file=3D/dev/vm/leela-u04,cache=3Dnone,if=3Dvirtio -drive file=3D/dev/vm/lee= la-u05,cache=3Dnone,if=3Dvirtio -drive file=3D/dev/vm/leela-u06,cache=3Dnone,if=3Dvirtio -drive file=3D/dev/vm/leela-u07,cache=3Dnone,if=3Dvirtio -drive file=3D/dev/vm/lee= la-u08,cache=3Dnone,if=3Dvirtio -drive file=3D/dev/vm/leela-u09,cache=3Dnone,if=3Dvirtio -drive file=3D/dev/vm/leela-space,cache=3Dnone,if=3Dvirtio -m 7168 -smp 8 -net nic,model=3Dvirtio,macaddr=3D00:16:3e:00:00:96 -net tap -daemonize -vnc :4 = -k es -localtime -monitor telnet:localhost:4004,server,nowait -serial telnet:localhost:4044,server,no= wait To make the switch from Virtio to SCSI I would have to shut down the hosts, which would not be a good idea whereas are two productive systems. At least, before doing so I would be sure of what might be the problem. Taking a current measurement in VMHost with free, I got the following: ss04:~# free total used free shared buffers cached Mem: 16461588 16406504 55084 0 2920 21504 -/+ buffers/cache: 16382080 79508 Swap: 2028492 983140 1045352 It draws attention to me that thinking about initially leaving a margin of 2 GB of RAM for the VMHost, already it has used almost half of swap. Thanks for your reply. Regards, Daniel --=20 Fingerprint: BFB3 08D6 B4D1 31B2 72B9 29CE 6696 BF1B 14E6 1D37 Powered by Debian GNU/Linux Lenny - Linux user #188.598 --Q0rSlbzrZN6k9QnT Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAkw6QPoACgkQZpa/GxTmHTfknACcCdqkmqPsa349Pbs3mwmd1U+u n9cAniJUwoOVwdYWO2kTocbPaYrJWwz9 =dZ4G -----END PGP SIGNATURE----- --Q0rSlbzrZN6k9QnT--