lkml.org 
[lkml]   [2001]   [Sep]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRE: CPU frequency shifting "problems"
>  > APM is a lost cause, but the correct solution for ACPI systems is 
>to use the
>> PM timer.
>
>This is _completely_ untrue.
>
>The PM timer is (a) inaccurate and (b) slow as hell.
>
>Linux uses TSC because we want high accuracy (nanosecond scale) without
>having slow stuff.

Please, don't confuse accuracy with precision. The TSC is precise
but not accurate. The 100Hz timer is more accurate, especially given
a SpeedStep CPU, but much less precise. It's a subtle distinction,
but an important one.

--
--------------------------------------------------------------
from: Jonathan "Chromatix" Morton
mail: chromi@cyberspace.org (not for attachments)
website: http://www.chromatix.uklinux.net/vnc/
geekcode: GCS$/E dpu(!) s:- a20 C+++ UL++ P L+++ E W+ N- o? K? w--- O-- M++$
V? PS PE- Y+ PGP++ t- 5- X- R !tv b++ DI+++ D G e+ h+ r++ y+(*)
tagline: The key to knowledge is not to rely on people to teach you it.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:03    [W:0.051 / U:1.272 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site