Re: [PATCH 00/15] PowerMac i2c API conversions & windfarm updates

On Wed, 2012-04-25 at 12:29 +0200, Andreas Schwab wrote:

Benjamin Herrenschmidt [off-list ref] writes:

quoted

Also, does the new driver properly react to load ?

The old driver keeps the cpu fans running at 300 rpm (lowest speed?)
for much longer when the cpus are put busy.  Only when the cpus are back
idle it speeds them up to 1200 rpm or more for some time depending on
how long the cpus were busy.  The new driver is faster at speeding up
the fans to around 800 rpm when cpus get busy, and keeps them running
longer at that speed, but doesn't appear to select much higher speeds.

The old driver appears to be better suited to desktops, whereas the new
driver is probably better for servers.

That's odd... as I said, the algorithm is supposed to be the same...

But the most annoying sound appears to be coming from the slots fan.

Constant or changing ? The slots fan is set to a fixed speed, which I
thought was constant (well, I "tickle" it a bit but roughly it's
constant). Or is that not the case for you ?

Darwin has an algorithm for it based on getting some data from the video
driver in the AGP slot, but I don't have that.

Cheers,
Ben.