From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1GcnrK-0003Hc-0j for qemu-devel@nongnu.org; Wed, 25 Oct 2006 14:52:14 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1GcnrH-0003H6-Jc for qemu-devel@nongnu.org; Wed, 25 Oct 2006 14:52:12 -0400 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1GcnrH-0003H3-EJ for qemu-devel@nongnu.org; Wed, 25 Oct 2006 14:52:11 -0400 Received: from [71.162.243.5] (helo=grelber.thyrsus.com) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA:32) (Exim 4.52) id 1GcnrH-0002YK-Hh for qemu-devel@nongnu.org; Wed, 25 Oct 2006 14:52:11 -0400 From: Rob Landley Subject: Re: [Qemu-devel] A question about QEMU performance Date: Wed, 25 Oct 2006 14:51:53 -0400 References: <29036817.1159299723859.JavaMail.root@eastrmwml06.mgt.cox.net> <56d259a00609270127x1d825a5eo481057d8123cf16d@mail.gmail.com> In-Reply-To: <56d259a00609270127x1d825a5eo481057d8123cf16d@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200610251451.54279.rob@landley.net> 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 Cc: Martin Guy On Wednesday 27 September 2006 4:27 am, Martin Guy wrote: > There are some statistics at freaknet.org/martin/QEMU for various > types of x86 processor, but giving only BogoMIPS, which are way > overrated. > I presume this is cos QEMU translates the kernel speed test loop once > then runs it as x86 code, while "real" tasks need to be translated all > the time. There is a cache of translated pages, and last I checked (0.8.0 or so) the entire translation cache was flushed when it filled up, rather than trying to do any kind of LRU-style thing. I think of qemu as a processor with a bigger than normal penalty for faulting executable pages from DRAM into L2. :) Rob -- "Perfection is reached, not when there is no longer anything to add, but when there is no longer anything to take away." - Antoine de Saint-Exupery