From: Lee Revell <rlrevell@joe-job.com>
To: john stultz <johnstul@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>,
linux-kernel@vger.kernel.org,
"Paul E. McKenney" <paulmck@us.ibm.com>,
"K.R. Foley" <kr@cybsft.com>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
pluto@agmk.net, john cooper <john.cooper@timesys.com>,
Benedikt Spranger <bene@linutronix.de>,
Daniel Walker <dwalker@mvista.com>,
Tom Rini <trini@kernel.crashing.org>,
George Anzinger <george@mvista.com>
Subject: Re: test time-warps [was: Re: 2.6.14-rt13]
Date: Mon, 21 Nov 2005 20:31:43 -0500 [thread overview]
Message-ID: <1132623104.4772.8.camel@mindpipe> (raw)
In-Reply-To: <1132616496.31144.27.camel@cog.beaverton.ibm.com>
On Mon, 2005-11-21 at 15:41 -0800, john stultz wrote:
> I believe this is the same dual-core TSC drift that has been seen w/
> x86-64. I have just added some similar logic to the TSC clocksource
> that mimics what x86-64 does so an alternative clocksource will be
> selected automatically.
>
> I should be sending out another release later tonight with these
> updates.
>
It is really unfortunate that the TSC cannot be used for timekeeping on
these machines. I wrote a simple benchmark that shows rdtsc on
Fernando's box to be insanely fast - 10000 iterations in 68
microseconds. This was an order of magnitude faster than any other
machine we tested. Why would they bother making it so fast if it's
useless for timekeeping?
Lee
next prev parent reply other threads:[~2005-11-22 1:31 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-15 9:08 2.6.14-rt13 Ingo Molnar
2005-11-15 16:36 ` 2.6.14-rt13 Mark Knecht
2005-11-15 19:57 ` 2.6.14-rt13 Paul E. McKenney
2005-11-16 3:48 ` 2.6.14-rt13 K.R. Foley
2005-11-16 8:40 ` 2.6.14-rt13 Ingo Molnar
2005-11-16 17:02 ` 2.6.14-rt13 Paul E. McKenney
2005-11-18 18:02 ` 2.6.14-rt13 Fernando Lopez-Lezcano
2005-11-18 21:54 ` 2.6.14-rt13 Lee Revell
2005-11-18 22:05 ` 2.6.14-rt13 Fernando Lopez-Lezcano
2005-11-18 22:07 ` 2.6.14-rt13 Ingo Molnar
2005-11-18 22:15 ` 2.6.14-rt13 Lee Revell
2005-11-18 22:25 ` 2.6.14-rt13 Steven Rostedt
2005-11-18 23:36 ` 2.6.14-rt13 Fernando Lopez-Lezcano
2005-11-18 23:57 ` 2.6.14-rt13 Steven Rostedt
2005-11-18 22:41 ` 2.6.14-rt13 Fernando Lopez-Lezcano
2005-11-19 2:39 ` 2.6.14-rt13 Steven Rostedt
2005-11-24 15:07 ` 2.6.14-rt13 Ingo Molnar
2005-11-24 15:21 ` 2.6.14-rt13 Steven Rostedt
2005-11-25 20:56 ` [RFC][PATCH] Runtime switching to idle_poll (was: Re: 2.6.14-rt13) Steven Rostedt
2005-11-26 13:05 ` Ingo Molnar
2005-11-29 2:48 ` [RFC][PATCH] Runtime switching of the idle function [take 2] Steven Rostedt
2005-11-29 3:02 ` Andrew Morton
2005-11-29 3:42 ` Steven Rostedt
2005-11-29 4:01 ` Andrew Morton
2005-11-29 6:44 ` Ingo Molnar
2005-11-29 6:55 ` Nick Piggin
2005-11-29 18:05 ` Andi Kleen
2005-11-29 14:19 ` Steven Rostedt
2005-11-29 14:50 ` Andi Kleen
2005-11-29 15:42 ` Steven Rostedt
2005-12-02 1:27 ` Max Krasnyansky
2005-12-02 1:45 ` Andi Kleen
2005-12-03 2:17 ` Max Krasnyansky
2005-11-29 4:22 ` john stultz
2005-11-29 14:22 ` Steven Rostedt
2005-11-29 13:08 ` Pavel Machek
2005-12-18 15:26 ` Steven Rostedt
2005-11-18 22:13 ` 2.6.14-rt13 Lee Revell
2005-11-18 22:32 ` 2.6.14-rt13 Vojtech Pavlik
2005-11-19 2:28 ` 2.6.14-rt13 George Anzinger
2005-11-19 7:45 ` 2.6.14-rt13 Vojtech Pavlik
2005-11-19 18:27 ` 2.6.14-rt13 Lee Revell
2005-11-21 21:32 ` 2.6.14-rt13 Fernando Lopez-Lezcano
2005-11-21 21:41 ` 2.6.14-rt13 john stultz
[not found] ` <20051121221511.GA7255@elte.hu>
2005-11-21 22:19 ` test time-warps [was: Re: 2.6.14-rt13] Ingo Molnar
2005-11-21 23:08 ` Fernando Lopez-Lezcano
2005-11-21 23:38 ` Fernando Lopez-Lezcano
2005-11-21 23:41 ` john stultz
2005-11-22 1:31 ` Lee Revell [this message]
2005-11-22 1:15 ` Steven Rostedt
2005-11-22 11:16 ` Ingo Molnar
2005-11-22 17:49 ` Fernando Lopez-Lezcano
2005-11-22 18:01 ` Christopher Friesen
2005-11-22 18:22 ` Steven Rostedt
2005-11-22 20:52 ` Ingo Molnar
2005-11-22 11:19 ` 2.6.14-rt13 Ingo Molnar
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