Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758871Ab3CYSDg (ORCPT ); Mon, 25 Mar 2013 14:03:36 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:32840 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758261Ab3CYSDf (ORCPT ); Mon, 25 Mar 2013 14:03:35 -0400 X-Authority-Analysis: v=2.0 cv=adbjbGUt c=1 sm=0 a=rXTBtCOcEpjy1lPqhTCpEQ==:17 a=mNMOxpOpBa8A:10 a=ZzSxI7jMevMA:10 a=5SG0PmZfjMsA:10 a=IkcTkHD0fZMA:10 a=meVymXHHAAAA:8 a=mVTtbqeYs4EA:10 a=pqHcbdlYP702Nec4d98A:9 a=QEXdDO2ut3YA:10 a=rXTBtCOcEpjy1lPqhTCpEQ==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 74.67.115.198 Message-ID: <1364234613.6345.184.camel@gandalf.local.home> Subject: Re: [RT LATENCY] 249 microsecond latency caused by slub's unfreeze_partials() code. From: Steven Rostedt To: Christoph Lameter Cc: LKML , RT , Thomas Gleixner , Clark Williams Date: Mon, 25 Mar 2013 14:03:33 -0400 In-Reply-To: <0000013da2ace21a-9e87fe8a-75c2-4b7c-b5e1-37ad196ce012-000000@email.amazonses.com> References: <1363906545.6345.81.camel@gandalf.local.home> <0000013d92c37ff3-5fb85400-bec1-4eda-8ba1-332566884c59-000000@email.amazonses.com> <1364010673.6345.156.camel@gandalf.local.home> <0000013da1f93be3-c3d42ae8-ff34-4c63-8094-77a83291ea19-000000@email.amazonses.com> <1364227073.6345.182.camel@gandalf.local.home> <1364228039.6345.183.camel@gandalf.local.home> <0000013da2ace21a-9e87fe8a-75c2-4b7c-b5e1-37ad196ce012-000000@email.amazonses.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.4.4-2 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 638 Lines: 19 On Mon, 2013-03-25 at 17:51 +0000, Christoph Lameter wrote: > On Mon, 25 Mar 2013, Steven Rostedt wrote: > > > BTW, what impact does setting all cpu_partial files to zero have on the > > system? > > Slight slowdown in kfree since the frees are less likely to be batched. If this makes it more deterministic, and lower worse case latencies, then it's definitely worth the price. -- Steve -- 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/