From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41242) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XPBP6-000358-NM for qemu-devel@nongnu.org; Wed, 03 Sep 2014 10:19:26 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XPBOw-00010u-1F for qemu-devel@nongnu.org; Wed, 03 Sep 2014 10:19:20 -0400 Received: from mx1.redhat.com ([209.132.183.28]:20652) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XPBOv-00010f-QL for qemu-devel@nongnu.org; Wed, 03 Sep 2014 10:19:09 -0400 Message-ID: <5407234F.4060003@redhat.com> Date: Wed, 03 Sep 2014 16:18:55 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <1401889659-24035-1-git-send-email-pl@kamp.de> <53903469.8070902@msgid.tls.msk.ru> <539FDCAD.5060006@kamp.de> <53A02351.8060900@redhat.com> <53A02867.7090400@kamp.de> <53A02AA6.2060006@redhat.com> <54048EE8.3040305@kamp.de> <54061ADA.7040109@kamp.de> <1AAAA9D6-D7FE-447C-B136-AB3F66F67D35@kamp.de> In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH] block/iscsi: use 16 byte CDBs only when necessary List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: ronnie sahlberg , Peter Lieven Cc: Kevin Wolf , Michael Tokarev , qemu-devel , Stefan Hajnoczi Il 03/09/2014 16:17, ronnie sahlberg ha scritto: > I think (a) would be best. > But I would suggest some small modifications: > > Set the default max to something even smaller, like 256 sectors. This > should not have much effect on throughput since the client/initiator > can just send several concurrent i/os instead of one large i/o. I disagree. 256 sectors are 128k, that's a fairly normal I/O size. Paolo