From: Steven Rostedt <rostedt@goodmis.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>,
tglx@linutronix.de, linux-kernel@vger.kernel.org
Subject: Re: Ktimer / -rt9 (+custom) monotonic_clock going backwards.
Date: Thu, 20 Oct 2005 12:09:42 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.58.0510201208460.30996@localhost.localdomain> (raw)
In-Reply-To: <20051020155525.GA10360@elte.hu>
On Thu, 20 Oct 2005, Ingo Molnar wrote:
>
> * Steven Rostedt <rostedt@goodmis.org> 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
next prev parent reply other threads:[~2005-10-20 16:09 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-19 14:59 Steven Rostedt
2005-10-19 15:10 ` Thomas Gleixner
2005-10-19 18:39 ` john stultz
2005-10-20 6:55 ` Steven Rostedt
2005-10-20 7:34 ` Ingo Molnar
2005-10-20 7:46 ` Steven Rostedt
2005-10-20 8:01 ` Ingo Molnar
2005-10-20 8:56 ` Steven Rostedt
2005-10-20 8:59 ` Ingo Molnar
2005-10-20 9:04 ` Steven Rostedt
2005-10-20 9:05 ` Steven Rostedt
2005-10-20 10:05 ` Steven Rostedt
2005-10-20 10:05 ` Steven Rostedt
2005-10-20 15:55 ` Ingo Molnar
2005-10-20 16:09 ` Steven Rostedt [this message]
2005-10-20 16:45 ` john stultz
2005-10-20 16:58 ` Steven Rostedt
2005-10-20 17:05 ` john stultz
2005-10-20 19:32 ` Ingo Molnar
2005-10-20 20:05 ` john stultz
2005-10-20 20:54 ` Ingo Molnar
2005-10-21 6:03 ` Steven Rostedt
2005-10-21 7:49 ` Thomas Gleixner
2005-10-21 7:57 ` Steven Rostedt
2005-10-21 8:00 ` ktimer API Steven Rostedt
2005-10-21 8:09 ` Thomas Gleixner
2005-10-21 18:09 ` Ktimer / -rt9 (+custom) monotonic_clock going backwards john stultz
2005-10-21 18:15 ` Thomas Gleixner
2005-10-20 22:06 ` George Anzinger
2005-10-20 6:19 ` Steven Rostedt
2005-10-20 14:34 ` Steven Rostedt
2005-10-20 15:18 ` Steven Rostedt
2005-10-20 15:23 ` Steven Rostedt
2005-10-20 16:01 ` Steven Rostedt
2005-10-19 15:11 ` Ingo Molnar
2005-10-20 6:38 ` Steven Rostedt
2005-10-20 6:56 ` Ingo Molnar
2005-10-19 15:21 ` Daniel Walker
2005-10-20 6:39 ` Steven Rostedt
2005-10-20 15:02 ` Daniel Walker
2005-10-20 22:19 ` George Anzinger
2005-10-20 23:23 ` john stultz
2005-10-19 16:44 ` Frank Sorenson
2005-10-20 6:43 ` Steven Rostedt
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