Re: Problems running latencytest: "error setting freq 1024"

[Takashi Iwai <tiwai@suse.de>]

At Tue, 23 Mar 2004 22:42:05 +0100,
Frank Barknecht wrote:
> 
> Hallo,
> Paul Davis hat gesagt: // Paul Davis wrote:
> 
> > >$ measure -p ./out/x11.png -o ./out/x11.out -c 0 -f 1024 -n 2 -t 2
> > >I get this error message: "error setting freq 1024"
> > 
> > probably a permissions problem. try it as root.
> 
> This is while runng at root. (Sorry for the "$" I typed that one by
> hand). 
> 
> A tip from Tim Goetze to do: 
> 
>  # echo 2048 > /proc/sys/dev/rtc/max-user-freq
> (^ sic!)
> 
> didn't help either yet. I did a strace on the measure run now, which
> showed something equally strange (to my eyes): 
> 
> mlockall(MCL_CURRENT|MCL_FUTURE)        = 0
> sched_get_priority_max(0x1)             = 99
> sched_setscheduler(0, 0x1, 0xbfffe254)  = 0
> open("/dev/midi0", O_RDWR)              = 3
> ioctl(3, 0x40047401, 0x400)             = -1 ENOTTY (Inappropriate ioctl for device)
> write(2, "error setting freq 1024\n", 24) = 24
> exit_group(1)                           = ?

please make sure that you loaded latency-test module.


> I'm still puzzled. Why "/dev/midi0"?

that's because the latency-test kernel module requires a device file
for ioctls.  i chose it simply because the file is unused (it's for
tclmidi).

BTW, i uploaded latencytest-0.5.3.  it includes i/o workloads in
parallel.

	http://www.alsa-project.org/~iwai/latencytest-0.5.3.tar.gz


Takashi


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