From: Tim Bird <tim.bird@am.sony.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: BogoMIPS no longer supported on PowerPC?
Date: Wed, 23 Aug 2006 09:32:56 -0700 [thread overview]
Message-ID: <44EC8338.3050203@am.sony.com> (raw)
In-Reply-To: <1156329453.3914.13.camel@ux156>
Johannes Berg wrote:
> On Wed, 2006-08-23 at 18:25 +0800, Li Yang-r58472 wrote:
> > I noticed a recent modification to __delay has changed from using empty
> > loops to reading timebase. Thus, breaks the calculation of bogomips,
> > and makes it terribly low. Is the bogomips no longer being supported on
> > powerpc arch?
>
> What's there to be 'supported'? The only purpose of bogomips is
> calibrating the delay loop, and that has changed now by using timebase,
> hence bogomips no longer have a purpose. There was even a patch to
> remove it from /proc/cpuinfo but I'm not sure whether that got applied
> or not.
I missed the patch for this, but I have a related question.
What is the status of the calibration code now for PPC?
Is it just skipped?
I assume that the ability to set a preset loops_per_jiffy
is no longer relevant?
-- Tim
=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Electronics
=============================
next prev parent reply other threads:[~2006-08-23 16:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-23 10:25 BogoMIPS no longer supported on PowerPC? Li Yang-r58472
2006-08-23 10:37 ` Johannes Berg
2006-08-23 10:55 ` Li Yang-r58472
2006-08-23 14:51 ` Olof Johansson
2006-08-23 16:47 ` Li Yang
2006-08-23 18:06 ` Linas Vepstas
2006-08-23 16:32 ` Tim Bird [this message]
2006-08-23 16:46 ` Li Yang
2006-08-23 16:50 ` Olaf Hering
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