Re: [BUG] jiffies counter leaps in 2.6.24-rc3

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Nov 29, 2007 at 11:35:11AM +0100, Ingo Molnar wrote:
 
 > * Stefano Brivio <[email protected]> wrote:
 > 
 > > Ok, I found out how to reliably reproduce this bug. The root session issue
 > > was a bit weird, but I noticed I usually switch to root only when I need to
 > > change the CPU frequency. And here's what happens:
 > > 
 > > # cpuspeedy min
 > > [after some time...]
 > > Nov 29 09:42:31 morte [ 4408.722597] b43-phy0 ERROR: PHY transmission error
 > > 
 > > # cpuspeedy max
 > > Nov 29 09:42:41 morte [ 1177.238599] wmaster0: STA 00:14:c1:35:8d:eb Average rate: 540 (2160/4)
 > > 
 > > It looks like jiffies get scaled exactly by a 3.75 factor, which is
 > > <max_frequency>/<min_frequency> here. I use acpi-cpufreq and this is my
 > 
 > ah, the cpufreq/acpi/acpi-cpufreq angle is indeed a big clue. I've 
 > Cc:-ed various interested parties.
 
Hmm, what's in /sys/devices/system/clocksource/clocksource0/current_clocksource  ?

adjust_jiffies() always gets called on a speed transition. I'm wondering
if perhaps we shouldn't do that if we're using something other than
the tsc for timekeeping.

	Dave

-- 
http://www.codemonkey.org.uk
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux