On Sam, 2013-07-20 at 23:33 +0300, Aaro Koskinen wrote:
> Hi,
>
> On Sat, Jul 20, 2013 at 09:16:49AM +1000, Benjamin Herrenschmidt wrote:
> > On Fri, 2013-07-19 at 20:43 +0300, Aaro Koskinen wrote:
> > > I booted a Xserve today with 3.11-rc1, and noticed the noise is coming
> > > from slots-fan (PCI fan?) which is always 99%, although the slots-temp is
> > > just 33. Is it on purpose the rm31 slots PID params are totally different
> > > from therm_pm72 slots params? It seems like they have been copied from
> > > pm72 "drive bay" PID params instead.
> >
> > Could be my mistake. What happens if you change them to match the old code ?
>
> I tried the change below (use SLOTS_PID_* values from therm_pm72.h),
> and the noise level is considerably lower. The slots-fan stays at 19%,
> and slots-temp rises to 42'C but not higher after running couple of hours.
>
> diff --git a/drivers/macintosh/windfarm_rm31.c
> b/drivers/macintosh/windfarm_rm31.c
> index 0b9a79b..82fc86a 100644
> --- a/drivers/macintosh/windfarm_rm31.c
> +++ b/drivers/macintosh/windfarm_rm31.c
> @@ -439,15 +439,15 @@ static void backside_setup_pid(void)
>
> /* Slots fan */
> static const struct wf_pid_param slots_param = {
> - .interval = 5,
> - .history_len = 2,
> - .gd = 30 << 20,
> - .gp = 5 << 20,
> - .gr = 0,
> - .itarget = 40 << 16,
> - .additive = 1,
> - .min = 300,
> - .max = 4000,
> + .interval = 1,
> + .history_len = 20,
> + .gd = 0,
> + .gp = 0,
> + .gr = 0x00100000,
> + .itarget = 3200000,
> + .additive = 0,
> + .min = 20,
> + .max = 100,
> };
>
> static void slots_fan_tick(void)
Could a similar change fix the same problem on desktop G5s? The same
values for slots_param in windfarm_pm112.c don't help, unfortunately.
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Debian, X and DRI developer
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