From: Masami Hiramatsu <mhiramat@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Mathieu Desnoyers <compudj@krystal.dyndns.org>,
Martin Bligh <mbligh@google.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
darren@dvhart.com, "Frank Ch. Eigler" <fche@redhat.com>,
systemtap-ml <systemtap@sources.redhat.com>
Subject: Re: Unified tracing buffer
Date: Tue, 23 Sep 2008 16:03:52 -0400 [thread overview]
Message-ID: <48D94BA8.9030106@redhat.com> (raw)
In-Reply-To: <alpine.LFD.1.10.0809232129280.2038@apollo.tec.linutronix.de>
Thomas Gleixner wrote:
> On Tue, 23 Sep 2008, Masami Hiramatsu wrote:
>> # cat /sys/devices/system/cpu/cpu0/cpuidle/state3/usage
>> 171210
>
> C3 stops the TSC. So depending on how many C3 entries you have on the
> different cores, your TSCs will drift apart. Some BIOSes do even a
> lousy job trying to fixup the TSCs on exit from C3, which makes things
> even worse.
>
>> C1: type[C1] promotion[--] demotion[--] latency[001] usage[00000016] duration[00000000000000000000]
>> C2: type[C2] promotion[--] demotion[--] latency[001] usage[00037969] duration[00000000000024288003]
>> C3: type[C3] promotion[--] demotion[--] latency[057] usage[00171818] duration[00000000001881257636]
>>
>> Could these help you?
>
> Yup, explains your TSC observation. Nothing we can do about. Broken by
> system design :( Welcome in the wonderful world of Inhell/BIOS/ACPI !
Thank you for analyzing! :-)
Hmm, then could I fix that by fixing my dsdt...?
Thanks again,
>
> Thanks,
>
> tglx
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com
next prev parent reply other threads:[~2008-09-23 20:06 UTC|newest]
Thread overview: 122+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-19 21:33 Unified tracing buffer Martin Bligh
2008-09-19 21:42 ` Randy Dunlap
2008-09-19 21:57 ` Martin Bligh
2008-09-19 22:41 ` Olaf Dabrunz
2008-09-19 22:19 ` Martin Bligh
2008-09-20 8:10 ` Olaf Dabrunz
2008-09-20 8:29 ` Steven Rostedt
2008-09-20 11:40 ` Mathieu Desnoyers
2008-09-20 8:26 ` Steven Rostedt
2008-09-20 11:44 ` Mathieu Desnoyers
2008-09-19 22:28 ` Olaf Dabrunz
2008-09-19 22:09 ` Martin Bligh
2008-09-19 23:18 ` Frank Ch. Eigler
2008-09-20 8:50 ` Steven Rostedt
2008-09-20 13:37 ` Mathieu Desnoyers
2008-09-20 13:51 ` Steven Rostedt
2008-09-20 14:54 ` Steven Rostedt
2008-09-22 18:45 ` Mathieu Desnoyers
2008-09-22 21:39 ` Steven Rostedt
2008-09-23 3:27 ` Mathieu Desnoyers
2008-09-20 0:07 ` Peter Zijlstra
2008-09-22 14:07 ` K.Prasad
2008-09-22 14:45 ` Peter Zijlstra
2008-09-22 16:29 ` Martin Bligh
2008-09-22 16:36 ` Peter Zijlstra
2008-09-22 20:50 ` Masami Hiramatsu
2008-09-23 3:05 ` Mathieu Desnoyers
2008-09-23 2:49 ` Mathieu Desnoyers
2008-09-23 5:25 ` Tom Zanussi
2008-09-23 9:31 ` Peter Zijlstra
2008-09-23 18:13 ` Mathieu Desnoyers
2008-09-23 18:33 ` Christoph Lameter
2008-09-23 18:56 ` Linus Torvalds
2008-09-23 13:50 ` Mathieu Desnoyers
2008-09-23 14:00 ` Martin Bligh
2008-09-23 17:55 ` K.Prasad
2008-09-23 18:27 ` Martin Bligh
2008-09-24 3:50 ` Tom Zanussi
2008-09-24 5:42 ` K.Prasad
2008-09-25 6:07 ` [RFC PATCH 0/8] current relay cleanup patchset Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 1/8] relay - Clean up relay_switch_subbuf() and make waking up consumers optional Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 2/8] relay - Make the relay sub-buffer switch code replaceable Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 3/8] relay - Add channel flags to relay, remove global callback param Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 4/8] relay - Add reserved param to switch-subbuf, in preparation for non-pad write/reserve Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 5/8] relay - Map the first sub-buffer at the end of the buffer, for temporary convenience Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 6/8] relay - Replace relay_reserve/relay_write with non-padded versions Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 7/8] relay - Remove padding-related code from relay_read()/relay_splice_read() et al Tom Zanussi
2008-09-25 6:08 ` [RFC PATCH 8/8] relay - Clean up remaining padding-related junk Tom Zanussi
2008-09-23 5:27 ` [PATCH 1/3] relay - clean up subbuf switch Tom Zanussi
2008-09-23 20:15 ` Andrew Morton
2008-09-23 5:27 ` [PATCH 2/3] relay - make subbuf switch replaceable Tom Zanussi
2008-09-23 20:17 ` Andrew Morton
2008-09-23 5:27 ` [PATCH 3/3] relay - add channel flags Tom Zanussi
2008-09-23 20:20 ` Andrew Morton
2008-09-24 3:57 ` Tom Zanussi
2008-09-20 0:26 ` Unified tracing buffer Marcel Holtmann
2008-09-20 9:03 ` Steven Rostedt
2008-09-20 13:55 ` Mathieu Desnoyers
2008-09-20 14:12 ` Arjan van de Ven
2008-09-22 18:52 ` Mathieu Desnoyers
2008-10-02 15:28 ` Jason Baron
2008-10-03 16:11 ` Mathieu Desnoyers
2008-10-03 18:37 ` Jason Baron
2008-10-03 19:10 ` Mathieu Desnoyers
2008-10-03 19:25 ` Jason Baron
2008-10-03 19:56 ` Mathieu Desnoyers
2008-10-03 20:25 ` Jason Baron
2008-10-03 21:52 ` Frank Ch. Eigler
2008-09-22 3:09 ` KOSAKI Motohiro
2008-09-22 9:57 ` Peter Zijlstra
2008-09-23 2:36 ` Mathieu Desnoyers
2008-09-22 13:57 ` K.Prasad
2008-09-22 19:45 ` Masami Hiramatsu
2008-09-22 20:13 ` Martin Bligh
2008-09-22 22:25 ` Masami Hiramatsu
2008-09-22 23:11 ` Darren Hart
2008-09-23 0:04 ` Masami Hiramatsu
2008-09-22 23:16 ` Martin Bligh
2008-09-23 0:05 ` Masami Hiramatsu
2008-09-23 0:12 ` Martin Bligh
2008-09-23 14:49 ` Masami Hiramatsu
2008-09-23 15:04 ` Mathieu Desnoyers
2008-09-23 15:30 ` Masami Hiramatsu
2008-09-23 16:01 ` Linus Torvalds
2008-09-23 17:04 ` Masami Hiramatsu
2008-09-23 17:30 ` Thomas Gleixner
2008-09-23 18:59 ` Masami Hiramatsu
2008-09-23 19:36 ` Thomas Gleixner
2008-09-23 19:38 ` Martin Bligh
2008-09-23 19:41 ` Thomas Gleixner
2008-09-23 19:50 ` Martin Bligh
2008-09-23 20:03 ` Thomas Gleixner
2008-09-23 21:02 ` Martin Bligh
2008-09-23 20:03 ` Masami Hiramatsu [this message]
2008-09-23 20:08 ` Thomas Gleixner
2008-09-23 15:46 ` Linus Torvalds
2008-09-23 0:39 ` Linus Torvalds
2008-09-23 1:26 ` Roland Dreier
2008-09-23 1:39 ` Steven Rostedt
2008-09-23 2:02 ` Mathieu Desnoyers
2008-09-23 2:26 ` Darren Hart
2008-09-23 2:31 ` Mathieu Desnoyers
2008-09-23 3:26 ` Linus Torvalds
2008-09-23 3:36 ` Mathieu Desnoyers
2008-09-23 4:05 ` Linus Torvalds
2008-09-23 3:43 ` Steven Rostedt
2008-09-23 4:10 ` Masami Hiramatsu
2008-09-23 4:17 ` Martin Bligh
2008-09-23 15:23 ` Masami Hiramatsu
2008-09-23 10:53 ` Steven Rostedt
2008-09-23 4:19 ` Linus Torvalds
2008-09-23 14:12 ` Mathieu Desnoyers
2008-09-23 2:30 ` Mathieu Desnoyers
2008-09-23 3:06 ` Masami Hiramatsu
2008-09-23 14:36 ` KOSAKI Motohiro
2008-09-23 15:02 ` Frank Ch. Eigler
2008-09-23 15:21 ` Masami Hiramatsu
2008-09-23 17:59 ` KOSAKI Motohiro
2008-09-23 18:28 ` Martin Bligh
2008-09-23 3:33 ` Andi Kleen
2008-09-23 3:47 ` Martin Bligh
2008-09-23 5:04 ` Andi Kleen
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