From: Martin Wilck <martin.wilck@fujitsu-siemens.com>
To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
"Wichert, Gerhard" <Gerhard.Wichert@fujitsu-siemens.com>,
"Maciej W. Rozycki" <macro@linux-mips.org>
Subject: Re: [PATCH] x86 (64): make calibrate_APIC_clock() SMI-safe (take 2)
Date: Fri, 25 Jul 2008 15:38:47 +0200 [thread overview]
Message-ID: <4889D767.5050709@fujitsu-siemens.com> (raw)
In-Reply-To: <20080725125950.GA28466@lenovo>
I wrote:
> I have to say that my simplified patch failed to do the calibration
> correctly on our test system (the original patch worked well). Please
> stay tuned, we are investigating this currently.
Please forget that. It was observed on an old "enterprise" kernel with
which we are currently testing the backported patch with, and it was due
to the fact that the initial counter value on that kernel was divided by
APIC_DIVISOR (=16). The resulting initial counter value was too low in a
"SMI flood" case, the counter could overlap. APIC_DIVISOR is no longer
used in the current kernel.
Martin
--
Martin Wilck
PRIMERGY System Software Engineer
FSC IP ESP DEV 6
Fujitsu Siemens Computers GmbH
Heinz-Nixdorf-Ring 1
33106 Paderborn
Germany
Tel: ++49 5251 8 15113
Fax: ++49 5251 8 20209
Email: mailto:martin.wilck@fujitsu-siemens.com
Internet: http://www.fujitsu-siemens.com
Company Details: http://www.fujitsu-siemens.com/imprint.html
next prev parent reply other threads:[~2008-07-25 13:40 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-24 10:47 [PATCH] x86 (64): make calibrate_APIC_clock() smp-safe Martin Wilck
2008-07-24 11:16 ` Cyrill Gorcunov
2008-07-24 11:58 ` Martin Wilck
2008-07-24 12:05 ` Cyrill Gorcunov
2008-07-24 13:55 ` [PATCH] x86 (64): make calibrate_APIC_clock() SMI-safe Martin Wilck
2008-07-24 14:31 ` Cyrill Gorcunov
2008-07-24 15:01 ` Cyrill Gorcunov
2008-07-24 15:13 ` Martin Wilck
2008-07-25 9:02 ` [PATCH] x86 (64): make calibrate_APIC_clock() SMI-safe (take 2) Martin Wilck
2008-07-25 10:08 ` Cyrill Gorcunov
2008-07-25 12:29 ` Martin Wilck
2008-07-25 12:59 ` Cyrill Gorcunov
2008-07-25 13:38 ` Martin Wilck [this message]
2008-07-25 13:48 ` Cyrill Gorcunov
2008-07-25 14:01 ` [PATCH] x86 (64): make calibrate_APIC_clock() SMI-safe (take 3) Martin Wilck
2008-07-25 14:15 ` Cyrill Gorcunov
2008-07-25 15:01 ` Cyrill Gorcunov
2008-07-25 15:13 ` Martin Wilck
2008-07-25 15:39 ` Cyrill Gorcunov
2008-07-26 15:40 ` Ingo Molnar
2009-03-12 9:41 ` Jean Delvare
2009-03-12 13:38 ` Martin Wilck
2008-07-25 16:51 ` [PATCH] x86 (64): make calibrate_APIC_clock() SMI-safe (take 2) Olaf Dabrunz
2008-07-24 13:31 ` [PATCH] x86 (64): make calibrate_APIC_clock() smp-safe H. Peter Anvin
2008-07-24 13:42 ` [PATCH] x86 (64): make calibrate_APIC_clock() SMI-safe Martin Wilck
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4889D767.5050709@fujitsu-siemens.com \
--to=martin.wilck@fujitsu-siemens.com \
--cc=Gerhard.Wichert@fujitsu-siemens.com \
--cc=gorcunov@gmail.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=macro@linux-mips.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.