From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:45243) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TLW5L-0005zg-CZ for qemu-devel@nongnu.org; Tue, 09 Oct 2012 05:26:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TLW5H-00055o-7K for qemu-devel@nongnu.org; Tue, 09 Oct 2012 05:26:43 -0400 Received: from mx1.redhat.com ([209.132.183.28]:36178) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TLW5G-00055G-Ut for qemu-devel@nongnu.org; Tue, 09 Oct 2012 05:26:39 -0400 Message-ID: <5073EDB3.3020804@redhat.com> Date: Tue, 09 Oct 2012 11:26:11 +0200 From: Avi Kivity MIME-Version: 1.0 References: <1348577763-12920-1-git-send-email-pbonzini@redhat.com> <20121008113932.GB16332@stefanha-thinkpad.redhat.com> <5072CE54.8020208@redhat.com> <20121009090811.GB13775@stefanha-thinkpad.redhat.com> In-Reply-To: <20121009090811.GB13775@stefanha-thinkpad.redhat.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] Block I/O outside the QEMU global mutex was "Re: [RFC PATCH 00/17] Support for multiple "AIO contexts"" List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Hajnoczi Cc: Kevin Wolf , Paolo Bonzini , Anthony Liguori , Ping Fan Liu , qemu-devel@nongnu.org On 10/09/2012 11:08 AM, Stefan Hajnoczi wrote: > Here are the steps that have been mentioned: > > 1. aio fastpath - for raw-posix and other aio block drivers, can we reduce I/O > request latency by skipping block layer coroutines? Is coroutine overhead noticable? > I'm also curious about virtqueue_pop()/virtqueue_push() outside the QEMU mutex > although that might be blocked by the current work around MMIO/PIO dispatch > outside the global mutex. It is, yes. -- error compiling committee.c: too many arguments to function