Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752860Ab1FMN32 (ORCPT ); Mon, 13 Jun 2011 09:29:28 -0400 Received: from e28smtp02.in.ibm.com ([122.248.162.2]:47982 "EHLO e28smtp02.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752445Ab1FMN30 (ORCPT ); Mon, 13 Jun 2011 09:29:26 -0400 In-Reply-To: <20110607160830.GB17581@redhat.com> References: <20110607160830.GB17581@redhat.com> Subject: Re: [PATCHv2 RFC 0/4] virtio and vhost-net capacity handling X-KeepSent: E36F9C2B:43D9DB04-652578AE:0048E1AB; type=4; name=$KeepSent To: "Michael S. Tsirkin" Cc: Christian Borntraeger , Carsten Otte , habanero@linux.vnet.ibm.com, Heiko Carstens , kvm@vger.kernel.org, lguest@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux390@de.ibm.com, netdev@vger.kernel.org, Rusty Russell , Martin Schwidefsky , steved@us.ibm.com, Tom Lendacky , virtualization@lists.linux-foundation.org, Shirley Ma X-Mailer: Lotus Notes Release 8.5.1 September 28, 2009 Message-ID: From: Krishna Kumar2 Date: Mon, 13 Jun 2011 19:02:27 +0530 X-MIMETrack: Serialize by Router on d23ml172/23/M/IBM(Release 8.5.1FP5|September 29, 2010) at 13/06/2011 19:02:28 MIME-Version: 1.0 Content-type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2246 Lines: 85 "Michael S. Tsirkin" wrote on 06/07/2011 09:38:30 PM: > > This is on top of the patches applied by Rusty. > > > > Warning: untested. Posting now to give people chance to > > comment on the API. > > OK, this seems to have survived some testing so far, > after I dropped patch 4 and fixed build for patch 3 > (build fixup patch sent in reply to the original). > > I'll be mostly offline until Sunday, would appreciate > testing reports. Hi Michael, I ran the latest patches with 1K I/O (guest->local host) and the results are (60 sec run for each test case): ______________________________ #sessions BW% SD% ______________________________ 1 -25.6 47.0 2 -29.3 22.9 4 .8 1.6 8 1.6 0 16 -1.6 4.1 32 -5.3 2.1 48 11.3 -7.8 64 -2.8 .7 96 -6.2 .6 128 -10.6 12.7 ______________________________ BW: -4.8 SD: 5.4 I tested it again to see if the regression is fleeting (since the numbers vary quite a bit for 1K I/O even between guest-> local host), but: ______________________________ #sessions BW% SD% ______________________________ 1 14.0 -17.3 2 19.9 -11.1 4 7.9 -15.3 8 9.6 -13.1 16 1.2 -7.3 32 -.6 -13.5 48 -28.7 10.0 64 -5.7 -.7 96 -9.4 -8.1 128 -9.4 .7 ______________________________ BW: -3.7 SD: -2.0 With 16K, there was an improvement in SD, but higher sessions seem to slightly degrade BW/SD: ______________________________ #sessions BW% SD% ______________________________ 1 30.9 -25.0 2 16.5 -19.4 4 -1.3 7.9 8 1.4 6.2 16 3.9 -5.4 32 0 4.3 48 -.5 .1 64 32.1 -1.5 96 -2.1 23.2 128 -7.4 3.8 ______________________________ BW: 5.0 SD: 7.5 Thanks, - KK -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/