Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756398AbXFHERL (ORCPT ); Fri, 8 Jun 2007 00:17:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754100AbXFHEQ4 (ORCPT ); Fri, 8 Jun 2007 00:16:56 -0400 Received: from e1.ny.us.ibm.com ([32.97.182.141]:55145 "EHLO e1.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754052AbXFHEQz (ORCPT ); Fri, 8 Jun 2007 00:16:55 -0400 Date: Thu, 7 Jun 2007 21:16:51 -0700 From: "Paul E. McKenney" To: Steven Rostedt Cc: john stultz , Ingo Molnar , Thomas Gleixner , Oleg Nesterov , LKML , Dipankar Sarma , RT Subject: Re: [PATCH RT] convert RCU Preempt tasklet into softirq. Message-ID: <20070608041651.GA19912@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <1181180051.18444.31.camel@localhost.localdomain> <20070607041411.GB1783@linux.vnet.ibm.com> <1181226138.18444.54.camel@localhost.localdomain> <20070607161754.GA11941@linux.vnet.ibm.com> <1181240819.10408.14.camel@localhost.localdomain> <1181242307.10408.17.camel@localhost.localdomain> <1181247369.10408.20.camel@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1181247369.10408.20.camel@localhost.localdomain> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1066 Lines: 25 On Thu, Jun 07, 2007 at 04:16:09PM -0400, Steven Rostedt wrote: > On Thu, 2007-06-07 at 14:51 -0400, Steven Rostedt wrote: > > > There might still be an issue here. With the patch I'm getting a really > > slow response time on networking. But that be because of other patches I > > have applied. > > I removed this patch and I can still get the network slowdown/hang. So > this patch is unrelated to this issue. RCU on the otherhand has not been > cleared of suspicion. Might the slowdown be due to different kernel threads running at different priorities? I could easily believe that changing the priority of the kernel thread processing RCU callbacks could have a noticeable effect on performance in some cases. In other news, passed a set of kernbenches at this end, so starting an rcutorture. Thanx, Paul - 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/