From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41735) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X0e3j-0000oU-0o for qemu-devel@nongnu.org; Fri, 27 Jun 2014 17:52:00 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1X0e3Z-00046O-VE for qemu-devel@nongnu.org; Fri, 27 Jun 2014 17:51:50 -0400 Received: from mail-wg0-x233.google.com ([2a00:1450:400c:c00::233]:65366) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X0e3Z-000463-Oq for qemu-devel@nongnu.org; Fri, 27 Jun 2014 17:51:41 -0400 Received: by mail-wg0-f51.google.com with SMTP id x12so5617991wgg.22 for ; Fri, 27 Jun 2014 14:51:40 -0700 (PDT) Sender: Paolo Bonzini Message-ID: <53ADE769.3060903@redhat.com> Date: Fri, 27 Jun 2014 23:51:37 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <20140627120129.GO12061@stefanha-thinkpad.muc.redhat.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [regression] dataplane: throughout -40% by commit 580b6b2aa2 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Ming Lei , Stefan Hajnoczi Cc: Kevin Wolf , Fam Zheng , qemu-devel@nongnu.org, "Michael S. Tsirkin" Il 27/06/2014 20:01, Ming Lei ha scritto: > I just implemented plug&unplug based batching, and it is working now. > But throughout still has no obvious improvement. > > Looks loading in IOthread is a bit low, so I am wondering if there is > block point caused by Qemu QEMU block layer. What does perf say? Also, you can try using the QEMU trace subsystem and see where the latency goes. Paolo