Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756303AbZJCP6E (ORCPT ); Sat, 3 Oct 2009 11:58:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754359AbZJCP6D (ORCPT ); Sat, 3 Oct 2009 11:58:03 -0400 Received: from mail.gmx.net ([213.165.64.20]:51149 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752335AbZJCP6D (ORCPT ); Sat, 3 Oct 2009 11:58:03 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1/v6lcjzMbvTqAc0nNzLosQcj1gjPfAapZlHt2qEs kRroAsJXmzjtWe Subject: Re: Do not overload dispatch queue (Was: Re: IO scheduler based IO controller V10) From: Mike Galbraith To: Jens Axboe Cc: Vivek Goyal , Ingo Molnar , Linus Torvalds , Ulrich Lukas , linux-kernel@vger.kernel.org, containers@lists.linux-foundation.org, dm-devel@redhat.com, nauman@google.com, dpshah@google.com, lizf@cn.fujitsu.com, mikew@google.com, fchecconi@gmail.com, paolo.valente@unimore.it, ryov@valinux.co.jp, fernando@oss.ntt.co.jp, jmoyer@redhat.com, dhaval@linux.vnet.ibm.com, balbir@linux.vnet.ibm.com, righi.andrea@gmail.com, m-ikeda@ds.jp.nec.com, agk@redhat.com, akpm@linux-foundation.org, peterz@infradead.org, jmarchan@redhat.com, riel@redhat.com In-Reply-To: <20091003151445.GF31616@kernel.dk> References: <20091002181903.GN31616@kernel.dk> <1254548931.8299.18.camel@marge.simson.net> <1254549378.8299.21.camel@marge.simson.net> <20091003112915.GA12925@redhat.com> <20091003124049.GB12925@redhat.com> <20091003132115.GB31616@kernel.dk> <20091003135623.GD12925@redhat.com> <1254578553.7499.5.camel@marge.simson.net> <20091003142840.GE31616@kernel.dk> <1254581496.8293.8.camel@marge.simson.net> <20091003151445.GF31616@kernel.dk> Content-Type: text/plain Date: Sat, 03 Oct 2009 17:57:00 +0200 Message-Id: <1254585420.7539.2.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.24.1.1 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-FuHaFi: 0.58 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2553 Lines: 53 On Sat, 2009-10-03 at 17:14 +0200, Jens Axboe wrote: > On Sat, Oct 03 2009, Mike Galbraith wrote: > > On Sat, 2009-10-03 at 16:28 +0200, Jens Axboe wrote: > > > On Sat, Oct 03 2009, Mike Galbraith wrote: > > > > On Sat, 2009-10-03 at 09:56 -0400, Vivek Goyal wrote: > > > > > > > > > I have kept the overload delay period as "cfq_slice_sync" same as Mike had > > > > > done. We shall have to experiment what is a good waiting perioed. Is 100ms > > > > > too long if we are waiting for a request from same process which recently > > > > > finished IO and we did not enable idle on it. > > > > > > > > > > I guess we can tweak the delay period as we move along. > > > > > > > > I kept the delay period very short to minimize possible damage. Without > > > > the idle thing, it wasn't enough, but with, worked a treat, as does your > > > > patch. > > > > > > Can you test the current line up of patches in for-linus? It has the > > > ramp up I talked about included as well. > > > > Well, it hasn't hit git.kernel.org yet, it's at... > > > > * block-for-linus 1d22351 cfq-iosched: add a knob for desktop interactiveness > > It's the top three patches here, kernel.org sync sometimes takes a > while... > > http://git.kernel.dk/?p=linux-2.6-block.git;a=shortlog;h=refs/heads/for-linus Ok, already had the first two in, added the last. Entered uncharted territory for konsole -e exit, but lost a bit of throughput for home-brew concurrent git test. perf stat 1.70 1.94 1.32 1.89 1.87 1.7 fairness=1 overload_delay=1 1.55 1.79 1.38 1.53 1.57 1.5 desktop=1 +last_end_sync 1.09 0.87 1.11 0.96 1.11 1.0 block-for-linus perf stat testo.sh Avg 108.12 106.33 106.34 97.00 106.52 104.8 1.000 fairness=0 overload_delay=0 93.98 102.44 94.47 97.70 98.90 97.4 .929 fairness=0 overload_delay=1 90.87 95.40 95.79 93.09 94.25 93.8 .895 fairness=1 overload_delay=0 89.93 90.57 89.13 93.43 93.72 91.3 .871 fairness=1 overload_delay=1 89.81 88.82 91.56 96.57 89.38 91.2 .870 desktop=1 +last_end_sync 92.61 94.60 92.35 93.17 94.05 93.3 .890 block-for-linus -Mike -- 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/