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From: dean gaudet <dean@arctic.org>
To: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
	akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] All Transmeta CPUs have constant TSCs
Date: Mon, 8 Jan 2007 00:02:26 -0800 (PST)	[thread overview]
Message-ID: <Pine.LNX.4.64.0701072358010.26307@twinlark.arctic.org> (raw)
In-Reply-To: <Pine.LNX.4.61.0701051524440.7813@yvahk01.tjqt.qr>

On Fri, 5 Jan 2007, Jan Engelhardt wrote:

> 
> On Jan 4 2007 17:48, H. Peter Anvin wrote:
> >
> >[i386] All Transmeta CPUs have constant TSCs
> >All Transmeta CPUs ever produced have constant-rate TSCs.
> 
> A TSC is ticking according to the CPU frequency, is not it?

transmeta decided years before intel and amd that a constant rate tsc 
(unaffected by P-state) was the only sane choice.  on transmeta cpus the 
tsc increments at the maximum cpu frequency no matter what the P-state 
(and no matter what longrun is doing behind the kernel's back).

mind you, many people thought this was a crazy choice at the time...

-dean

  reply	other threads:[~2007-01-08  8:02 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-05  1:48 H. Peter Anvin
2007-01-05 14:25 ` Jan Engelhardt
2007-01-08  8:02   ` dean gaudet [this message]
2007-01-08 20:19     ` Jan Engelhardt
2007-01-08 20:51       ` Chris Friesen
2007-01-08 20:51       ` H. Peter Anvin
2007-01-08 23:13         ` dean gaudet
2007-01-08 23:54           ` H. Peter Anvin

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