From: Andi Kleen <andi@firstfloor.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Dave Jones <davej@redhat.com>,
x86@kernel.org, Andi Kleen <andi@firstfloor.org>,
Arjan van de Ven <arjan@infradead.org>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: RFC: Bogus setting of CONSTANT TSC ?
Date: Sun, 13 Mar 2011 18:06:32 +0100 [thread overview]
Message-ID: <20110313170632.GK2499@one.firstfloor.org> (raw)
In-Reply-To: <alpine.LFD.2.00.1103121851390.2787@localhost6.localdomain6>
> This was initially introduced with commit 39b3a7 ([PATCH] i386/x86-64:
> Generalize X86_FEATURE_CONSTANT_TSC flag), though the changelog is
> utterly useless. Andi ??
Only Nehalem and beyond set the 8000_0007 flag, but Intel has had a constant
TSC since Yonah. That is what this logic implements.
However on Nehalem and beyond if the 8000_0007 is clear the BIOS wants
to tell us that it knows the system doesn't have a synchronized TSC.
This is currently still broken, but the timer watchdog usually catches
it later. It only affects a few relatively obscure systems.
-Andi
prev parent reply other threads:[~2011-03-13 17:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-11 21:24 RFC: Bogus setting of CONSTANT TSC ? Dave Jones
2011-03-12 18:58 ` Thomas Gleixner
2011-03-13 17:06 ` Andi Kleen [this message]
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=20110313170632.GK2499@one.firstfloor.org \
--to=andi@firstfloor.org \
--cc=arjan@infradead.org \
--cc=davej@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/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.