From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=56231 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PGai7-0006Xc-H9 for qemu-devel@nongnu.org; Thu, 11 Nov 2010 12:13:21 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PGahv-0000ea-Ck for qemu-devel@nongnu.org; Thu, 11 Nov 2010 12:13:08 -0500 Received: from mx1.redhat.com ([209.132.183.28]:30305) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PGahv-0000e2-30 for qemu-devel@nongnu.org; Thu, 11 Nov 2010 12:13:07 -0500 Date: Thu, 11 Nov 2010 19:12:40 +0200 From: "Michael S. Tsirkin" Message-ID: <20101111171240.GA30171@redhat.com> References: <1289483242-6069-1-git-send-email-stefanha@linux.vnet.ibm.com> <1289483242-6069-3-git-send-email-stefanha@linux.vnet.ibm.com> <4CDC20F1.1030305@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4CDC20F1.1030305@redhat.com> Subject: [Qemu-devel] Re: [PATCH 2/3] virtio-pci: Use ioeventfd for virtqueue notify List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Avi Kivity Cc: gleb@redhat.com, Stefan Hajnoczi , kvm@vger.kernel.org, qemu-devel@nongnu.org On Thu, Nov 11, 2010 at 06:59:29PM +0200, Avi Kivity wrote: > On 11/11/2010 03:47 PM, Stefan Hajnoczi wrote: > >Some virtio devices are known to have guest drivers which expect a notify to be > >processed synchronously and spin waiting for completion. Only enable ioeventfd > >for virtio-blk and virtio-net for now. > > Which drivers are these? > > I only know of the virtio-gl driver, which isn't upstream. I think that PXE virtio drivers do polling. But I think this change does not break these drivers. It'll probably make them a bit slower. Right, Gleb? -- MST