From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1Ki57S-0004d5-9i for qemu-devel@nongnu.org; Tue, 23 Sep 2008 06:27:46 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1Ki57Q-0004cs-UH for qemu-devel@nongnu.org; Tue, 23 Sep 2008 06:27:45 -0400 Received: from [199.232.76.173] (port=45498 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Ki57Q-0004cp-Ns for qemu-devel@nongnu.org; Tue, 23 Sep 2008 06:27:44 -0400 Received: from mail2.shareable.org ([80.68.89.115]:34209) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1Ki57Q-0007E8-4t for qemu-devel@nongnu.org; Tue, 23 Sep 2008 06:27:44 -0400 Date: Tue, 23 Sep 2008 11:27:36 +0100 From: Jamie Lokier Subject: Re: [Qemu-devel] [PATCH 0/3] Refactor AIO to allow multiple AIO implementations Message-ID: <20080923102736.GA4619@shareable.org> References: <1222125454-21744-1-git-send-email-ryanh@us.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1222125454-21744-1-git-send-email-ryanh@us.ibm.com> Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: aliguori@us.ibm.com, kvm@vger.kernel.org Ryan Harper wrote: > Addtional work has been done on top of QEMU for KVM and virtio-blk > devices. While virtio-blk is not yet upstream in QEMU, the AIO > changes here provide a tremendous performance improvement (from 7.6% > of native, to 100% of randwrite, and 3.9% of native, to 101.4% of > native for seq write) for virtio devices with cache=off. Is the improvement due to using linux-aio instead of (Glibc's) posix-aio? Thanks, -- Jamie