Re: speedfreq: epia + longhaul + speedfreq + copying large files = freeze

[Jeremy Fitzhardinge <jeremy@goop.org>]

On Tue, 2004-12-21 at 16:00 +0100, Sebastian wrote:
> Dear Jeremy,
> 
> thanks for your tool! I like it best of all cpufreq daemons,

Thanks!

This problem sounds like a bug in the longhaul driver though, which I
don't really know anything about.  (The system should never crash,
regardless of what speedfreqd does.)  

I've cc:d the cpufreq list to see if someone there can help.  Dave?

	J

> Anyway, the Epia board normally runs fine with speedfreq. Frequency gets
> adjusted between 400Mhz and 600MHz. But when I start cutting
> advertisements out of the DVB recordings with the VDR software (Video
> Disk Recorder from Klaus Schmiedinger, www.cadsoft.de/vdr) after a short
> while it freezes.  The cutting process is simply like copying large
> files from one folder to another folder on the same partition. Mostly
> 1.7 to 2.7GB. I tried the following:
> 
> 1. Cutting a recording, cpufreq enabled, speedfreq daemon running:
> 
> System freeze.
> 
> 2. Copying large files manually, cpufreq enabled, speedfreq daemon running:
> 
> System freeze.
> 
> 3. Cutting a recording, cpufreq enabled, speedfreq daemon disabled:
> 
> Works.
> 
> 4. Copying large files manually, cpufreq enabled, speedfreq daemon disabled:
> 
> Works.
> 
> I'd like to add that sometimes I get messages in syslog telling me that
> speedfreq thought the actual frequency was xxx and discovered that the
> real frequency was something else. Once that was the last thing in
> syslog before a freeze. I don't know if this is relevant, because 99% of
> the freezes the syslog stays like it is, nothing gets added.
> 
> The kernel is a vanilla 2.6.9. The Linux Distribution is Gentoo stable. 
> Flags are "-O2 -march=c3 -fomit-frame-pointer -mmmx -m3dnow -pipe". I 
> have no 4k stacks, no preemption, no nptl, no perl ithreads.
> 
> Maybe speedfreq changing frequencies too fast for the little Epia is the 
> reason for the freezes? What can I do?