Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932373AbVJTQJ6 (ORCPT ); Thu, 20 Oct 2005 12:09:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932344AbVJTQJ6 (ORCPT ); Thu, 20 Oct 2005 12:09:58 -0400 Received: from ms-smtp-04.nyroc.rr.com ([24.24.2.58]:58500 "EHLO ms-smtp-04.nyroc.rr.com") by vger.kernel.org with ESMTP id S932373AbVJTQJ5 (ORCPT ); Thu, 20 Oct 2005 12:09:57 -0400 Date: Thu, 20 Oct 2005 12:09:42 -0400 (EDT) From: Steven Rostedt X-X-Sender: rostedt@localhost.localdomain To: Ingo Molnar cc: john stultz , tglx@linutronix.de, linux-kernel@vger.kernel.org Subject: Re: Ktimer / -rt9 (+custom) monotonic_clock going backwards. In-Reply-To: <20051020155525.GA10360@elte.hu> Message-ID: References: <1129747172.27168.149.camel@cog.beaverton.ibm.com> <20051020073416.GA28581@elte.hu> <20051020080107.GA31342@elte.hu> <20051020085955.GB2903@elte.hu> <20051020155525.GA10360@elte.hu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1058 Lines: 35 On Thu, 20 Oct 2005, Ingo Molnar wrote: > > * Steven Rostedt wrote: > > > > I just switched cycle_t to u64 and hackbench no longer makes the time go > > > backwards. > > > > > > John, would this cause any problems to keep cycle_t at s64? > > > > I mean at u64. > > ugh. There's both cycles_t and cycle_t. We should unify the two and it > should be 64-bit. The faster systems get, the sooner the 32-bit counter > overflows. 64-bit systems are keeping 32-bit compatibility for quite > some time to come. So with an 8GHz CPU the 32-bit cycle_t would wrap in > like 500 msecs, way too fast to rely on ... (even with a 4GHz CPUs it's > only one second.) > > i've made cycle_t u64 and have uploaded -rt14. > Ingo, I'm disappointed in you, I expected you to upload 2.6.14-rc5-rt1 ;-) -- Steve - 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/