From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753549Ab1LLRVq (ORCPT ); Mon, 12 Dec 2011 12:21:46 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:48751 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752826Ab1LLRVo (ORCPT ); Mon, 12 Dec 2011 12:21:44 -0500 Date: Mon, 12 Dec 2011 18:20:00 +0100 From: Ingo Molnar To: Alan Cox Cc: Sasha Levin , Thomas Gleixner , Pekka Enberg , LKML Subject: Re: [patch 0/3] kvm tool: Serial emulation overhaul Message-ID: <20111212172000.GB23870@elte.hu> References: <20111210132220.083204833@linutronix.de> <20111211103047.GA19299@elte.hu> <20111211155347.GA1297@elte.hu> <1323667836.4190.4.camel@lappy> <20111212111222.GA21121@elte.hu> <20111212112052.30a568f7@pyramind.ukuu.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20111212112052.30a568f7@pyramind.ukuu.org.uk> User-Agent: Mutt/1.5.21 (2010-09-15) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Alan Cox wrote: > > [*] Also, those 10K cycles include some significant Qemu > > overhead - a couple of thousand cycles - that should be much > > lower in the tools/kvm case. > > Are all the traps going into qemu - is KVM still that braindead ? I don't know what exactly Marcelo has measured - it seems a PIO trap handled by the VM monitor process - i.e. Qemu in that case. Thanks, Ingo