* G5 noisier under linux than firmware or OSX
@ 2005-01-07 15:25 Chris Friesen
2005-01-08 11:22 ` Jerome Glisse
0 siblings, 1 reply; 3+ messages in thread
From: Chris Friesen @ 2005-01-07 15:25 UTC (permalink / raw)
To: linuxppc-dev
I've noticed that when booting, right around the time the kernel first
accesses my disks the fan speed jumps a bit. It's not full-on vacuum
cleaner howling, just a bit noisier.
I've only got the one machine so I can't do A/B comparisons, but it
seems to be quieter when running OSX.
Is linux using the same fan speed parameters, or are we maybe a bit
conservative?
Chris
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: G5 noisier under linux than firmware or OSX
2005-01-07 15:25 G5 noisier under linux than firmware or OSX Chris Friesen
@ 2005-01-08 11:22 ` Jerome Glisse
2005-01-17 6:55 ` Benjamin Herrenschmidt
0 siblings, 1 reply; 3+ messages in thread
From: Jerome Glisse @ 2005-01-08 11:22 UTC (permalink / raw)
To: Chris Friesen; +Cc: linuxppc-dev
Chris Friesen wrote:
> I've noticed that when booting, right around the time the kernel first
> accesses my disks the fan speed jumps a bit. It's not full-on vacuum
> cleaner howling, just a bit noisier.
>
> I've only got the one machine so I can't do A/B comparisons, but it
> seems to be quieter when running OSX.
>
> Is linux using the same fan speed parameters, or are we maybe a bit
> conservative?
From my memory, there have been some guess on values for
therm regulation as Apple seems to not give informations or
source code on that. Thus the values for regulating the fan are not
the same as OS X.
By the way, i also hear little more noise. The question is : Should
we lower the speed or stay with this conservative values ? :)
best,
Jerome Glisse
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: G5 noisier under linux than firmware or OSX
2005-01-08 11:22 ` Jerome Glisse
@ 2005-01-17 6:55 ` Benjamin Herrenschmidt
0 siblings, 0 replies; 3+ messages in thread
From: Benjamin Herrenschmidt @ 2005-01-17 6:55 UTC (permalink / raw)
To: Jerome Glisse; +Cc: linuxppc-dev list
On Sat, 2005-01-08 at 12:22 +0100, Jerome Glisse wrote:
>
> From my memory, there have been some guess on values for
> therm regulation as Apple seems to not give informations or
> source code on that. Thus the values for regulating the fan are not
> the same as OS X.
>
> By the way, i also hear little more noise. The question is : Should
> we lower the speed or stay with this conservative values ? :)
On G5s where thermal control is supported, the values are exactly the
same except for the fan of the slots bay.
Ben.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2005-01-07 15:25 G5 noisier under linux than firmware or OSX Chris Friesen
2005-01-08 11:22 ` Jerome Glisse
2005-01-17 6:55 ` Benjamin Herrenschmidt
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