On Sun, 5 Oct 2008, Elias Oltmanns wrote: > Hi there, > > on my system, I observe some odd symptoms which I have troubled Thomas > with before. After some more investigation, I have come to the > conclusion that ath5k is at the bottom of this, but since I don't really > understand the connection, I thought that Thomas may perhaps throw some > light on the matter, after all, even though I still think that ath5k > will have to be fixed. The Behaviour I'm seeing is this: sometimes, > timers fire prematurely, i.e. a timer x started with > > mod_timer(&x, HZ/50); > > fires after less than 10 or even 1 msec rather than 20 msec. Trying to > get to the bottom of this, it struck me that these glitches only occur > when ath5k is loaded and an interface is brought up (ifconfig wlan0 up > is quite sufficient). Some more digging revealed that the occurrences of > such ``fast forward events'' coincided with the expiry of the > recalibration timer started for the interface. The same behaviour can be > observed on kernels 2.6.25.16, 2.6.26.5, 2.6.27-rc8-git8 and > next-20080919. We had an intermittent problem with jffies based timers between 2.6.27-rc6 and -rc8-latest. This is fixed in current mainline. It only happened when CONFIG_NOHZ=n and CONFIG_HIGH_RES_TIMERS=n or both options were disabled at the kernel commandline. I have no idea why this should happen on any other kernel versions. Can you please point me to the code in question (file, line number) ? Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
