lkml.org 
[lkml]   [2001]   [Dec]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: emu10k1 - interrupt storm?
From
Date
Rui Sousa <rui.p.m.sousa@clix.pt> writes:

> On 9 Dec 2001, Zlatko Calusic wrote:
>
> The emu10k1 only generates interrupts when playing pcm sound.
> The interrupt rate depends on the "fragment" size and is usually
> smaller than ~1000interrupts/s (this is 256bytes fragment 48Khz sample
> rate, 16bit, stereo).
>
> Is it possible there is another device producing these interrupts?
> On-board devices (usb, ...) that you don't use?
> Does this happen with this kernel only?

Hm, looks like it is really emu10k1. But...

When I booted into single user mode, the kernel wasn't reporting
interrupts. Then I started Gnome, and there they were. Finally I found
that killing/starting esd changes things. Whenever esd was up,
interrupts were generated, when I killed it interrupts would stop.

Then I straced esd daemon, just to find it was blocked on select().

{atlas} [~]# strace -p 705
select(12, [4 6 7 8 9 10 11], NULL, NULL, NULL
Strange, if esd is not doing any work (just sleeping) who generates
interrupts then?

Also, we don't know now is it the driver to blame, or silly esd daemon.

>
> Which functions do you see listed? If it's only "emu10k1_interrupt()"
> then the interrupt was not generated by the emu10k1.
>

Top 5 entries in the kernel profile:

475 __rdtsc_delay 16.9643
309 handle_IRQ_event 2.4919
178 do_softirq 0.8725
148 emu10k1_waveout_bh 0.7872
135 emu10k1_interrupt 0.6490

As time goes by, the numbers get bigger (that is only 15min after
reboot)...

Maybe it's time to enable debug option in the driver?

Sorry for late answer, I got busy yesterday...
--
Zlatko
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:14    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site