From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1Kw0N3-0002Ep-94 for qemu-devel@nongnu.org; Fri, 31 Oct 2008 16:13:25 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1Kw0N2-0002EH-Pq for qemu-devel@nongnu.org; Fri, 31 Oct 2008 16:13:24 -0400 Received: from [199.232.76.173] (port=41665 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Kw0N2-0002E9-Gw for qemu-devel@nongnu.org; Fri, 31 Oct 2008 16:13:24 -0400 Received: from yx-out-1718.google.com ([74.125.44.152]:39205) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1Kw0N2-0005w6-Np for qemu-devel@nongnu.org; Fri, 31 Oct 2008 16:13:24 -0400 Received: by yx-out-1718.google.com with SMTP id 3so584054yxi.82 for ; Fri, 31 Oct 2008 13:13:23 -0700 (PDT) Message-ID: <490B66E1.2070604@codemonkey.ws> Date: Fri, 31 Oct 2008 15:13:21 -0500 From: Anthony Liguori MIME-Version: 1.0 Subject: Re: [Qemu-devel] [5578] Increase default IO timeout from 10ms to 5s References: <20081031194105.GC16128@shareable.org> In-Reply-To: <20081031194105.GC16128@shareable.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Jamie Lokier wrote: > Anthony Liguori wrote: > >> With this patch, I see the number of wake-ups with an idle dynamic >> ticks guest drop from 80 per second to about 15 times per second. >> > > That's great, it really is, but shouldn't it be less than that? > > Did you look at the wakeup rate shown by powertop in the guest, to see > how many extra wakeups are caused by QEMU internals? > I don't have a guest handy that I could run powertop on, but I know of at least a few timers that can be gotten rid of (like the rtc timers). Regards, Anthony Liguori > -- Jamie > > >