Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932240AbVKBCzc (ORCPT ); Tue, 1 Nov 2005 21:55:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932241AbVKBCzc (ORCPT ); Tue, 1 Nov 2005 21:55:32 -0500 Received: from wproxy.gmail.com ([64.233.184.199]:61337 "EHLO wproxy.gmail.com") by vger.kernel.org with ESMTP id S932240AbVKBCzc convert rfc822-to-8bit (ORCPT ); Tue, 1 Nov 2005 21:55:32 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=cuWImGq5rLlqSpAdeMCi7TwORCBFkES50W5TG4zkCkTHM3rLCIuyCiTxf5ea+z4j2rCFysgDBj7lacdQ4OBxvIX+kCN90WexodWJfUIi2Wm8qwMto3V75pamsJYkS6X0YXzZwkhdeAur9Tr8+DWSHRj5XEe85zjzWMk/q1DnXfg= Message-ID: Date: Tue, 1 Nov 2005 21:55:31 -0500 From: Carlos Antunes To: Fernando Lopez-Lezcano Subject: Re: 2.6.14-rt1 Cc: Ingo Molnar , Rui Nuno Capela , "K.R. Foley" , Florian Schmidt , john stultz , Mark Knecht , Steven Rostedt , Thomas Gleixner , linux-kernel@vger.kernel.org In-Reply-To: <1130899662.12101.2.camel@cmn3.stanford.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Content-Disposition: inline References: <20051017160536.GA2107@elte.hu> <20051020195432.GA21903@elte.hu> <20051030133316.GA11225@elte.hu> <1130876293.6178.6.camel@cmn3.stanford.edu> <1130899662.12101.2.camel@cmn3.stanford.edu> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2221 Lines: 53 On 11/1/05, Fernando Lopez-Lezcano wrote: > On Tue, 2005-11-01 at 12:18 -0800, Fernando Lopez-Lezcano wrote: > > On Sun, 2005-10-30 at 14:33 +0100, Ingo Molnar wrote: > > > i have released the 2.6.14-rt1 tree, which can be downloaded from the > > > usual place: > > > > > > http://redhat.com/~mingo/realtime-preempt/ > > > > > > this release is mainly about ktimer fixes: it updates to the latest > > > ktimer tree from Thomas Gleixner (which includes John Stultz's latest > > > GTOD tree), it fixes TSC synchronization problems on HT systems, and > > > updates the ktimers debugging code. > > > > > > These together could fix most of the timer warnings and annoyances > > > reported for 2.6.14-rc5-rt kernels. In particular the new > > > TSC-synchronization code could fix SMP systems: the upstream TSC > > > synchronization method is fine for 1 usec resolution, but it was not > > > good enough for 1 nsec resolution and likely caused the SMP bugs > > > reported by Fernando Lopez-Lezcano and Rui Nuno Capela. > > > > > > Please re-report any bugs that remain. > > > > 2.6.14-rt2 seems to be running fine on my athlon x2 smp system. Apart > > from some time warp messages when starting up it looks fine so far (this > > is on fc4). > > Actually, after enough time logged in (or maybe just with the kernel > running without a reboot) I still get the usual Jack warnings: > > delay of 5469.000 usecs exceeds estimated spare time of 2641.000; > restart ... > Fernando, I'm also having some when using SCHED_FIFO and SCHED_RR. When running several hundred threads, each sleeping on a loop for 20ms, SCHED_OTHER performs ok with latencies of less than 10ms while with SCHED_FIFO or SCHED_RR, I see latencies exceeding 1 full second! Carlos -- "We hold [...] that all men are created equal; that they are endowed [...] with certain inalienable rights; that among these are life, liberty, and the pursuit of happiness" -- Thomas Jefferson - 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/