From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992995AbbHHXXt (ORCPT ); Sat, 8 Aug 2015 19:23:49 -0400 Received: from cdptpa-outbound-snat.email.rr.com ([107.14.166.226]:33309 "EHLO cdptpa-oedge-vip.email.rr.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2992766AbbHHXXs (ORCPT ); Sat, 8 Aug 2015 19:23:48 -0400 Date: Sat, 8 Aug 2015 19:23:46 -0400 From: Steven Rostedt To: Paul Gortmaker Cc: , linux-rt-users , Thomas Gleixner , Carsten Emde , Sebastian Andrzej Siewior , John Kacur Subject: Re: [PATCH RT 0/6] Linux 3.14.48-rt49-rc1 Message-ID: <20150808192346.740ece60@grimm.local.home> In-Reply-To: <20150808231017.GG5998@windriver.com> References: <20150806221736.555188732@goodmis.org> <20150808231017.GG5998@windriver.com> X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.25; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-RR-Connecting-IP: 107.14.168.118:25 X-Cloudmark-Score: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 8 Aug 2015 19:10:17 -0400 Paul Gortmaker wrote: > So we took 20 IRQs in 5s, or 4/s ; not quite the 1/s minimum, but definitely not > the HZ/s we'd get w/o NOHZ_FULL. Re-running it got consistently 18-20 IRQ / 5s. OK, so NO_HZ_FULL still isn't great on -rt, but this shows that it keeps disturbances much lower than without it. Thanks for the report! -- Steve > > I specifically did NOT unplug and replug cores to "clean" them of tasks; the > hotplug code just seems to unstable for that from what I've seen in the past, > and by the looks of the irq counts above, there was no need to either. > > The rootfs was basically a ubu 14.10 server install (no X11/gfx) -- not that > it should matter - so long as other tasks weren't running on the nohz cores. > > Paul. > -- > > > > > Enjoy, > > > > -- Steve > >