Comment 9 for bug 1600599

Revision history for this message
teo1978 (teo8976) wrote :

> 1. What hardware is this being run on?

An Acer Aspire V3-571G which has an Intel Core i7-3632QM

> 2. You mentioned you disabled RAPL? Can you describe what you mean by that and how?

I created a file /etc/modprobe.d/blacklist-power.conf with these lines:
  blacklist intel_powerclamp
  blacklist intel_rapl

and I rebooted. I found that on StackExchange by googing "disable intel rapl".

After that (and before I shut down thermald completely) I stopped experiencing bug 1543046 as per the test mentioned in comment 31 (repeated while observing system unresponsiveness)

> I am supposing that from your actions in the comment #1 that you are no longer using thermald
> and therefore bug 1543046 is no longer going to be tested by you?

Well, for the moment I have only shut it down by "service thermald stop" and I haven't rebooted since. So I may try the fix some day. (To do that, I would first have to reenable the blacklisted kernel modules, because otherwise I don't observe the symptoms of that issue even with the unfixed thermald version.)

Since the pain is gone by just shutting down thermald, it's not high-priority for me to try that.

I had thought that bug 1543046 could be the cause of the general system slowdown because people in the Quality mailing list commented it was the cause of 1593468, but it seems to me that it's clearly the other way round:
1593468 causes higher-than-normal CPU consumption when playing video; this issue (1600599) causes powerclamp and rapl to kick in much sooner than they should, and this triggers (not "causes" but "triggers") issue 1543046. That's the only correlation between the three issues that makes sense to me. (note that they remain 3 separate issues)