From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753722AbaETOJD (ORCPT ); Tue, 20 May 2014 10:09:03 -0400 Received: from smtp.eu.citrix.com ([185.25.65.24]:47724 "EHLO SMTP.EU.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753570AbaETOJA (ORCPT ); Tue, 20 May 2014 10:09:00 -0400 X-Greylist: delayed 592 seconds by postgrey-1.27 at vger.kernel.org; Tue, 20 May 2014 10:08:59 EDT X-IronPort-AV: E=Sophos;i="4.98,874,1392163200"; d="scan'208";a="18227043" From: Felipe Franciosi To: "'Vitaly Kuznetsov'" CC: Konrad Rzeszutek Wilk , "axboe@kernel.dk" , "gregkh@linuxfoundation.org" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , "jerry.snitselaar@oracle.com" , "xen-devel@lists.xenproject.org" , "Roger Pau Monne" Subject: RE: [Xen-devel] Backport request to stable of two performance related fixes for xen-blkfront (3.13 fixes to earlier trees) Thread-Topic: [Xen-devel] Backport request to stable of two performance related fixes for xen-blkfront (3.13 fixes to earlier trees) Thread-Index: AQHPdBF/9eOx952jVEWObJvrwQWy4ZtJI9sAgAA1CuuAACSXUA== Date: Tue, 20 May 2014 13:59:05 +0000 Message-ID: <9F2C4E7DFB7839489C89757A66C5AD625AC66D@AMSPEX01CL03.citrite.net> References: <20140514191122.GA7659@phenom.dumpdata.com> <8738g44wxp.fsf@vitty.brq.redhat.com> <87ppj8zsfb.fsf@vitty.brq.redhat.com> <537B2F2C.4080905@citrix.com> <87lhtwznhl.fsf@vitty.brq.redhat.com> In-Reply-To: <87lhtwznhl.fsf@vitty.brq.redhat.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.69.135.199] Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 X-DLP: AMS1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id s4KE9Dn4012750 I had a small side-bar thread with Vitaly discussing the comprehensiveness of his measurements and how his tests are being conducted. He will report new results as they become available. In the meantime, I stand behind that the patches need to be backported and there is a regression if we don't do that. Ubuntu has already provided a test kernel with the patches pulled in. I will test those as soon as I get the chance (hopefully by the end of the week). See: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1319003 Felipe > -----Original Message----- > From: Vitaly Kuznetsov [mailto:vkuznets@redhat.com] > Sent: 20 May 2014 12:41 > To: Roger Pau Monne > Cc: Konrad Rzeszutek Wilk; axboe@kernel.dk; Felipe Franciosi; > gregkh@linuxfoundation.org; linux-kernel@vger.kernel.org; > stable@vger.kernel.org; jerry.snitselaar@oracle.com; xen- > devel@lists.xenproject.org > Subject: Re: [Xen-devel] Backport request to stable of two performance > related fixes for xen-blkfront (3.13 fixes to earlier trees) > > Roger Pau Monné writes: > > > On 20/05/14 11:54, Vitaly Kuznetsov wrote: > >> Vitaly Kuznetsov writes: > >> > >>> 1) ramdisks (/dev/ram*) (persistent grants and indirect descriptors > >>> disabled) > >> > >> sorry, there was a typo. persistent grants and indirect descriptors > >> are enabled with ramdisks, otherwise such testing won't make any sense. > > > > I'm not sure how is that possible, from your description I get that > > you are using 3.11 on the Dom0, which means blkback has support for > > persistent grants and indirect descriptors, but the guest is RHEL7, > > that's using the 3.10 kernel AFAICT, and this kernel only has > > persistent grants implemented. > > RHEL7 kernel is mostly merged with 3.11 in its Xen part, we have indirect > descriptors backported. > > Actually I tried my tests with upstream (Fedora) kernel and results were > similar. I can try comparing e.g. 3.11.10 with 3.12.0 and provide exact > measurements. > > -- > Vitaly {.n++%ݶw{.n+{G{ayʇڙ,jfhz_(階ݢj"mG?&~iOzv^m ?I