From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759659AbZATOlZ (ORCPT ); Tue, 20 Jan 2009 09:41:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755772AbZATOlP (ORCPT ); Tue, 20 Jan 2009 09:41:15 -0500 Received: from mx1.suse.de ([195.135.220.2]:36549 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755246AbZATOlO (ORCPT ); Tue, 20 Jan 2009 09:41:14 -0500 Date: Tue, 20 Jan 2009 15:41:09 +0100 From: Nick Piggin To: Ingo Molnar Cc: Linux Kernel Mailing List , Linus Torvalds , hpa@zytor.com, jeremy@xensource.com, chrisw@sous-sol.org, zach@vmware.com, rusty@rustcorp.com.au, Andrew Morton Subject: Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT Message-ID: <20090120144109.GK19505@wotan.suse.de> References: <20090120110542.GE19505@wotan.suse.de> <20090120112634.GA20858@elte.hu> <20090120140324.GA26424@elte.hu> <20090120141454.GI19505@wotan.suse.de> <20090120141735.GA9474@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090120141735.GA9474@elte.hu> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jan 20, 2009 at 03:17:35PM +0100, Ingo Molnar wrote: > > * Nick Piggin wrote: > > > > BTW. the lmbench test I run directly (it's called lat_mmap.c, and gets > > compiled into a standalone lat_mmap exec by the standard lmbench build). > > doesnt that include an indeterminate number of gettimeofday() based > calibration calls? That would make it harder to measure its total costs in > a comparative way. Hmm... yes probably for really detailed profile comparisons or other external measurements it would need modification.