Commit 29c0f7bd37a591a15fb79eece7761fb300293cf0
2012-06-28T09:42:24
Detect large swings in temperature when below the target temperature range and change fan by amounts dependant on the value of tdiff.
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diff --git a/adl.c b/adl.c
index 7c2bbde..8573e16 100644
--- a/adl.c
+++ b/adl.c
@@ -1025,6 +1025,7 @@ static int set_powertune(int gpu, int iPercentage)
static bool fan_autotune(int gpu, int temp, int fanpercent, int lasttemp, bool *fan_window)
{
struct cgpu_info *cgpu = &gpus[gpu];
+ int tdiff = round(temp - lasttemp);
struct gpu_adl *ga = &cgpu->adl;
int top = gpus[gpu].gpu_fan;
int bot = gpus[gpu].min_fan;
@@ -1039,7 +1040,7 @@ static bool fan_autotune(int gpu, int temp, int fanpercent, int lasttemp, bool *
cgpu->device_last_not_well = time(NULL);
cgpu->device_not_well_reason = REASON_DEV_OVER_HEAT;
cgpu->dev_over_heat_count++;
- } else if (temp > ga->targettemp && fanpercent < top && temp >= lasttemp) {
+ } else if (temp > ga->targettemp && fanpercent < top && tdiff >= 0) {
applog(LOG_DEBUG, "Temperature over target, increasing fanspeed");
if (temp > ga->targettemp + opt_hysteresis)
newpercent = ga->targetfan + 10;
@@ -1047,11 +1048,17 @@ static bool fan_autotune(int gpu, int temp, int fanpercent, int lasttemp, bool *
newpercent = ga->targetfan + 5;
if (newpercent > top)
newpercent = top;
- } else if (fanpercent > bot && temp < ga->targettemp - opt_hysteresis && temp <= lasttemp) {
- applog(LOG_DEBUG, "Temperature %d degrees below target, decreasing fanspeed", opt_hysteresis);
- newpercent = ga->targetfan - 1;
+ } else if (fanpercent > bot && temp < ga->targettemp - opt_hysteresis) {
+ /* Detect large swings of 5 degrees or more and change fan by
+ * a proportion more */
+ if (tdiff <= 0) {
+ applog(LOG_DEBUG, "Temperature %d degrees below target, decreasing fanspeed", opt_hysteresis);
+ newpercent = ga->targetfan - 1 + tdiff / 5;
+ } else if (tdiff >= 5) {
+ applog(LOG_DEBUG, "Temperature climbed %d while below target, increasing fanspeed", tdiff);
+ newpercent = ga->targetfan + tdiff / 5;
+ }
} else {
- int tdiff = round(temp - lasttemp);
/* We're in the optimal range, make minor adjustments if the
* temp is still drifting */