Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753088AbYKQTjr (ORCPT ); Mon, 17 Nov 2008 14:39:47 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752020AbYKQTji (ORCPT ); Mon, 17 Nov 2008 14:39:38 -0500 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:44601 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752009AbYKQTjh (ORCPT ); Mon, 17 Nov 2008 14:39:37 -0500 Date: Mon, 17 Nov 2008 11:39:36 -0800 (PST) Message-Id: <20081117.113936.81699150.davem@davemloft.net> To: mingo@elte.hu Cc: torvalds@linux-foundation.org, dada1@cosmosbay.com, rjw@sisk.pl, linux-kernel@vger.kernel.org, kernel-testers@vger.kernel.org, cl@linux-foundation.org, efault@gmx.de, a.p.zijlstra@chello.nl, shemminger@vyatta.com Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 From: David Miller In-Reply-To: <20081117184951.GA5585@elte.hu> References: <20081117182320.GA26844@elte.hu> <20081117184951.GA5585@elte.hu> X-Mailer: Mew version 6.1 on Emacs 22.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1352 Lines: 33 From: Ingo Molnar Date: Mon, 17 Nov 2008 19:49:51 +0100 > > * Ingo Molnar wrote: > > 4> The place for the sock_rfree() hit looks a bit weird, and i'll > > investigate it now a bit more to place the real overhead point > > properly. (i already mapped the test-bit overhead: that comes from > > napi_disable_pending()) > > ok, here's a new set of profiles. (again for tbench 64-thread on a > 16-way box, with v2.6.28-rc5-19-ge14c8bf and with the kernel config i > posted before.) Again, do a non-NMI profile and the top (at least for me) looks like this: samples % app name symbol name 473 6.3928 vmlinux finish_task_switch 349 4.7169 vmlinux tcp_v4_rcv 327 4.4195 vmlinux U3copy_from_user 322 4.3519 vmlinux tl0_linux32 178 2.4057 vmlinux tcp_ack 170 2.2976 vmlinux tcp_sendmsg 167 2.2571 vmlinux U3copy_to_user That tcp_v4_rcv() hit is %98 on the wake_up() call it does. -- 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/