From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1G5SoY-00046D-K5 for qemu-devel@nongnu.org; Tue, 25 Jul 2006 15:43:34 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1G5SoW-000460-6A for qemu-devel@nongnu.org; Tue, 25 Jul 2006 15:43:33 -0400 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1G5SoW-00045x-3w for qemu-devel@nongnu.org; Tue, 25 Jul 2006 15:43:32 -0400 Received: from [195.184.98.160] (helo=virtualhost.dk) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_3DES_EDE_CBC_SHA:24) (Exim 4.52) id 1G5Spt-00019O-80 for qemu-devel@nongnu.org; Tue, 25 Jul 2006 15:44:57 -0400 Received: from [62.242.22.158] (helo=router.home.kernel.dk) by virtualhost.dk with esmtp (Exim 3.36 #1) id 1G5SoS-0007e0-00 for qemu-devel@nongnu.org; Tue, 25 Jul 2006 21:43:28 +0200 Received: from nelson.home.kernel.dk ([192.168.0.33] helo=kernel.dk) by router.home.kernel.dk with esmtp (Exim 4.51) id 1G5SoP-0007w0-7R for qemu-devel@nongnu.org; Tue, 25 Jul 2006 21:43:25 +0200 Date: Tue, 25 Jul 2006 21:43:16 +0200 From: Jens Axboe Subject: Re: [Qemu-devel] Re: high CPU load / async IO? Message-ID: <20060725194316.GH4044@suse.de> References: Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: Content-Transfer-Encoding: quoted-printable 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 On Tue, Jul 25 2006, Sven K=F6hler wrote: > >>> So the current thread-based async dma patch is really just the wron= g long > >>> term solution. A more long term solution is likely in the works. = It > >>> requires quite a bit of code modification though. > >> > >> I see. So in other words: > >> > >> don't ask for simple async I/O now. The more complex and flexible > >> sollution will follow soon. > >=20 > > Yes, hopefully really soon. >=20 > So i will wait patiently :-) Is anyone actively working on this, or is it just speculation? I'd greatly prefer (and might do, if no one is working on it and Fabrice would take it) do a libaio version, since that'll for sure perform the best on Linux. But a posixaio version might be saner, as that should work on other operating systems as well. Fabrice, can you let people know what you would prefer? --=20 Jens Axboe