From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:50636) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QoHHk-0002oF-AI for qemu-devel@nongnu.org; Tue, 02 Aug 2011 11:53:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1QoHHj-0004Py-8m for qemu-devel@nongnu.org; Tue, 02 Aug 2011 11:53:36 -0400 Received: from mail-yw0-f45.google.com ([209.85.213.45]:45659) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QoHHj-0004Pt-5f for qemu-devel@nongnu.org; Tue, 02 Aug 2011 11:53:35 -0400 Received: by ywb3 with SMTP id 3so1635261ywb.4 for ; Tue, 02 Aug 2011 08:53:34 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: Date: Tue, 2 Aug 2011 16:53:33 +0100 Message-ID: From: Stefan Hajnoczi Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Subject: Re: [Qemu-devel] [PATCH v2] XBRLE page delta compression for live migration of large memory apps List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Shribman, Aidan" Cc: "qemu-devel@nongnu.org" On Tue, Aug 2, 2011 at 2:45 PM, Shribman, Aidan wr= ote: >> -----Original Message----- >> From: Stefan Hajnoczi [mailto:stefanha@gmail.com] >> Sent: Friday, July 08, 2011 12:07 AM >> To: Shribman, Aidan >> Cc: qemu-devel@nongnu.org; Anthony Liguori >> Subject: Re: [PATCH v2] XBRLE page delta compression for live >> migration of large memory apps >> >> >> Out of interest, why did ARC not work well as the caching algorithm? >> Did you try it out and measure its performance? >> > > ARC would be a good candidate for serving as the page cache (storing cont= ent previously sent pages) but due to potential legal issues in light of IB= M filing for patent on the ARC algorithm on November 2003 (see http://www.v= arlena.com/GeneralBits/96.php) I presume best if we refrain from using ARC = in QEMU until situation is fully cleared. I see. Thanks for explaining that, I was curious because the paper is very brief on the details of caching algorithm selection. Stefan