[ath9k-devel] ath9k: massive unexplained latency in 2.6.27 (rc5, rc6, probably others)

[Jean Schurger <jean@schurger.org>]

Le samedi 20 septembre 2008 ? 18:48 -0700, Steven Noonan a ?crit :

> On Sat, Sep 20, 2008 at 2:48 PM, Steven Noonan <steven@uplinklabs.net> wrote:
> > On Sat, Sep 20, 2008 at 2:26 PM, Luis R. Rodriguez
> > <lrodriguez@atheros.com> wrote:
> >> On Sat, Sep 20, 2008 at 2:22 PM, Steven Noonan <steven@uplinklabs.net> wrote:
> >>
> >>> Heh. I don't have an Xbox 360 or PS3 (sad, I know). Do have several
> >>> 2.4GHz phones. ;)
> >>
> >> Microwaves are the best to make the signal wet poop BTW, if you have
> >> that option available. Not sure if we can trigger the device that way
> >> but I'm just brainstorming here.
> >>
> >
> > Well, I've got the thing set to ATH_DBG_ANY (I want this damn bug
> > found!), which will certainly be *interesting*. In 5 minutes, the log
> > has jumped 9 megabytes.
> >
> > I've also got sadc monitoring IRQs so I know for certain when the
> > interrupt storm starts.
> >
> > I'll let you know how this goes.
> 
> OK, here's the time index at which it b0rked:
> 
> 18:28:38          sum   1106.00
> 18:28:39          sum   1037.62
> 18:28:40          sum   1069.00
> 18:28:41          sum   1167.00
> 18:28:42          sum   1155.00
> 18:28:43          sum   1339.00
> 18:28:44          sum  18355.00
> 18:28:45          sum  17845.45
> 18:28:46          sum  15285.00
> 18:28:47          sum  17511.00
> 18:28:48          sum  17568.69
> 18:28:49          sum  17704.04
> 18:28:50          sum  18566.67
> 18:28:51          sum  18913.13
> 
> And the entire log of the minute 18:28 is here:
> http://www.uplinklabs.net/~tycho/linux/18.28.00-59.log.gz
> 
> It looks pretty crazy.




Hi, i read your irq storm story with attention, as i it occurs to me
sometimes too, unfortunately, in this case, i cannot rescue from the
storm :)

(i have an AR5418) 

I did'nt found in which case the storm appear. I don't know if that
change something ut i "use"  Tickless System, i have only one proc.


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