From mboxrd@z Thu Jan 1 00:00:00 1970 From: Evgeniy Polyakov Subject: Re: QEMU PIC indirection patch for in-kernel APIC work Date: Tue, 10 Apr 2007 16:30:37 +0400 Message-ID: <20070410123034.GA11493@2ka.mipt.ru> References: <1176087018.11664.65.camel@localhost.localdomain> <4619E6DC.3010804@qumranet.com> <1176111984.11664.90.camel@localhost.localdomain> <461A41CA.9080201@qumranet.com> <20070410080729.GB16621@2ka.mipt.ru> <461B48A8.1060904@qumranet.com> <20070410085825.GA20004@2ka.mipt.ru> <461B7334.8090807@qumranet.com> <20070410115035.GA2247@2ka.mipt.ru> <461B8069.6070007@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, netdev To: Avi Kivity Return-path: Content-Disposition: inline In-Reply-To: <461B8069.6070007-atKUWr5tajBWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: netdev.vger.kernel.org On Tue, Apr 10, 2007 at 03:17:45PM +0300, Avi Kivity (avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org) wrote: > >Check a link please in case we are talking about different ideas: > >http://marc.info/?l=linux-netdev&m=112262743505711&w=2 > > > > > > I don't really understand what you're testing there. in particular, how > can the copying time change so dramatically depending on whether you've > just rebooted or not? I tested page remapping time - i.e. time to replace a page in two different mappings - the same should be performed in host and guest kernels if such design is going to be used for communication. I can only explain after-reboot slow copy with empty caches - arbitrary kernel pages were copied into buffer (not the same data as in posted code). -- Evgeniy Polyakov ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV