From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1MGtZg-0001PZ-Gn for qemu-devel@nongnu.org; Wed, 17 Jun 2009 07:45:04 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1MGtZb-0001Kw-Jy for qemu-devel@nongnu.org; Wed, 17 Jun 2009 07:45:03 -0400 Received: from [199.232.76.173] (port=56728 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1MGtZb-0001Kn-9h for qemu-devel@nongnu.org; Wed, 17 Jun 2009 07:44:59 -0400 Received: from mail2.shareable.org ([80.68.89.115]:40623) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1MGtZa-0002tr-CJ for qemu-devel@nongnu.org; Wed, 17 Jun 2009 07:44:58 -0400 Date: Wed, 17 Jun 2009 12:44:55 +0100 From: Jamie Lokier Subject: Re: [Qemu-devel] [PATCH 0/2] virtio indirect ring entries Message-ID: <20090617114455.GB27947@shareable.org> References: <1245234943.27028.38.camel@blaa> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1245234943.27028.38.camel@blaa> List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Mark McLoughlin Cc: qemu-devel Mark McLoughlin wrote: > Indirect ring entries has been merged for 2.6.31, these patches > implement the qemu side. I like the idea of increasing the ring capacity, but I see that this method still has limitations, and the effective capacity depends on the I/O submission pattern, which isn't very friendly. Has arbitrarily expandable rings (using tail pointer ring entries) ever been considered? -- Jamie