From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [tbench regression fixes]: digging out smelly deadmen. Date: Sat, 25 Oct 2008 20:55:01 -0700 (PDT) Message-ID: <20081025.205501.193695937.davem@davemloft.net> References: <200810250025.35734.rjw@sisk.pl> <20081024.163111.244324800.davem@davemloft.net> <200810251313.21120.rjw@sisk.pl> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: mingo@elte.hu, s0mbre@tservice.net.ru, a.p.zijlstra@chello.nl, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, efault@gmx.de To: rjw@sisk.pl Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:55062 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1750824AbYJZDzY (ORCPT ); Sat, 25 Oct 2008 23:55:24 -0400 In-Reply-To: <200810251313.21120.rjw@sisk.pl> Sender: netdev-owner@vger.kernel.org List-ID: From: "Rafael J. Wysocki" Date: Sat, 25 Oct 2008 13:13:20 +0200 > Could you please give me a pointer to the commit disabling the hrtimer feature? Here it is: commit 0c4b83da58ec2e96ce9c44c211d6eac5f9dae478 Author: Ingo Molnar Date: Mon Oct 20 14:27:43 2008 +0200 sched: disable the hrtick for now David Miller reported that hrtick update overhead has tripled the wakeup overhead on Sparc64. That is too much - disable the HRTICK feature for now by default, until a faster implementation is found. Reported-by: David Miller Acked-by: Peter Zijlstra Signed-off-by: Ingo Molnar diff --git a/kernel/sched_features.h b/kernel/sched_features.h index 7c9e8f4..fda0162 100644 --- a/kernel/sched_features.h +++ b/kernel/sched_features.h @@ -5,7 +5,7 @@ SCHED_FEAT(START_DEBIT, 1) SCHED_FEAT(AFFINE_WAKEUPS, 1) SCHED_FEAT(CACHE_HOT_BUDDY, 1) SCHED_FEAT(SYNC_WAKEUPS, 1) -SCHED_FEAT(HRTICK, 1) +SCHED_FEAT(HRTICK, 0) SCHED_FEAT(DOUBLE_TICK, 0) SCHED_FEAT(ASYM_GRAN, 1) SCHED_FEAT(LB_BIAS, 1)