lkml.org 
[lkml]   [2001]   [Oct]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: kapmidled and AMD K6-2
Hi!

> > for the AMD K6-2 on a DFI motherboard AT/ATX, using the AT power supply,
> > this option is buggy. I mean the cycles kapmidled works doesn't cool the
> > processor, they hot him.
>
> Initially, I thought was odd. The spec seemed straight forward
> enough, and doesn't say we have to do any special magic.
> Just that "During the execution of the HLT instruction, the AMD-K6-2
> processor executes a Halt special cycle."
>
> The next bit is interesting however..
>
> "After BRDY# is sampled asserted during this cycle, and then EWBE#
> is also sampled asserted (if not masked off), the processor enters
> the halt state in which the processor disables most of its internal
> clock distribution."
>
> EWBE is a feature that is enabled with bits 2-3 of the EFER MSR.
> This controls the behaviour of the CPU with respect to ordering
> of write cycles. Behaviour here can affect performance, and from
> my interpretation of the above, the amount of power saving that
> is possible.
>
> You can control the EWBE register using powertweak
> (http://www.powertweak.org), but if you don't want to/are unable
> to build that, and want to do some further tests, let me know
> and I'll hack something up.

If I don't want to build powertweak, are you willing to hack something up
for me? ;-). [My k6-2 is too hot to slow down CPU fan. I tried throttling
it using ACPI, but no success. I want to cool it down so that fan slows
and machine becomes quiet.]
Pavel
--
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.

-
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 13:08    [W:0.070 / U:26.436 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site