Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751466Ab2E0LCb (ORCPT ); Sun, 27 May 2012 07:02:31 -0400 Received: from mailout-de.gmx.net ([213.165.64.23]:33512 "HELO mailout-de.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751163Ab2E0LC3 (ORCPT ); Sun, 27 May 2012 07:02:29 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1+X3p5GvkKXzriDsjZPJF+Jv08OxnZedzjyYys+kO 88YN4l39UDvFpz Message-ID: <1338116545.27146.22.camel@marge.simpson.net> Subject: Re: [rfc][patch] select_idle_sibling() inducing bouncing on westmere From: Mike Galbraith To: Peter Zijlstra Cc: lkml , Suresh Siddha , Paul Turner , Arjan Van De Ven , Andreas Herrmann Date: Sun, 27 May 2012 13:02:25 +0200 In-Reply-To: <1338110259.7678.77.camel@marge.simpson.net> References: <1337857490.7300.19.camel@marge.simpson.net> <1337865431.9783.148.camel@laptop> <1337865641.9783.149.camel@laptop> <1337926468.5415.48.camel@marge.simpson.net> <1338014259.7302.26.camel@marge.simpson.net> <1338017364.14636.9.camel@twins> <1338020834.7747.8.camel@marge.simpson.net> <1338110259.7678.77.camel@marge.simpson.net> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1952 Lines: 43 BTW, there's something pretty darn strange going on in westmere land. Take a peek at this, note how upset it gets at large size, and how it then can't keep up with crusty old Q6600. Numbers are a bit erratic, but you'll see it. Identical kernels, not that kernel matters. Q6600 marge:/usr/local/tmp/lmbench3 # !968 for m in 16K 32K 64K 128K 256K 512K 1M 2M 4M 8M; do bin/x86_64-linux-gnu/bw_tcp -P 1 -N 3 -m $m localhost; done select_idle_sibling() !select_idle_sibling() 0.016384 1655.83 MB/sec 1628.55 MB/sec 0.032768 1816.77 MB/sec 2086.87 MB/sec 0.065536 3148.80 MB/sec 2117.82 MB/sec 0.131072 2356.40 MB/sec 1493.96 MB/sec 0.262144 2827.00 MB/sec 1908.48 MB/sec 0.524288 3301.68 MB/sec 1908.48 MB/sec 1.048576 3359.03 MB/sec 1553.58 MB/sec 2.097152 3143.11 MB/sec 2259.11 MB/sec 4.194304 3020.53 MB/sec 1949.93 MB/sec 8.388608 2823.97 MB/sec 1868.70 MB/sec E5620 rtbox:/usr/local/tmp/lmbench3 # !877 for m in 16K 32K 64K 128K 256K 512K 1M 2M 4M 8M; do bin/x86_64-linux-gnu/bw_tcp -P 1 -N 3 -m $m localhost; done select_idle_sibling() !select_idle_sibling() 0.016384 3461.28 MB/sec 2687.59 MB/sec 0.032768 4400.77 MB/sec 2939.77 MB/sec 0.065536 4517.30 MB/sec 2738.92 MB/sec 0.131072 3441.09 MB/sec 1894.25 MB/sec 0.262144 3919.65 MB/sec 2479.68 MB/sec 0.524288 1232.65 MB/sec 2341.83 MB/sec 1.048576 1230.15 MB/sec 2398.64 MB/sec 2.097152 1875.09 MB/sec 1591.16 MB/sec 4.194304 1382.21 MB/sec 1791.67 MB/sec 8.388608 1406.07 MB/sec 1078.92 MB/sec -- 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/