Problems running latencytest: "error setting freq 1024"

Problems running latencytest: "error setting freq 1024"

[Frank Barknecht]

Hallo,

I'd like to test my system's 2.6.4 latency using Takashi's
http://www.alsa-project.org/~iwai/latencytest-0.5.2.tar.gz
suite. 

Building and installing so far went fine, I can run all the tests but
no output is created. But I get a spurious error message which could be
the reason for this. If I run "measure" by hand as it is called by
"run_tests" like this: 
$ 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"

This seems to have something to do with the rtc-clock, but I have no
idea, what could be wrong here. Maybe it's something with my kernel
config? It looks like this: 

$ grep -i rtc /boot/config-2.6.4  
# CONFIG_HPET_EMULATE_RTC is not set
# CONFIG_APM_RTC_IS_GMT is not set
CONFIG_RTC=m
CONFIG_GEN_RTC=m
CONFIG_GEN_RTC_X=y
CONFIG_SND_RTCTIMER=m

Modules latency_test and rtc are loaded.

Any ideas?

ciao
-- 
 Frank Barknecht                               _ ______footils.org__


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

[Paul Davis]

>$ 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.


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

[Frank Barknecht]

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)                           = ?

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

ciao
-- 
 Frank Barknecht                               _ ______footils.org__


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

[Fernando Pablo Lopez-Lezcano]

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

Takashi is apparently using that to communicate with the latency test
kernel module (I think he mentions it in the README :-)

I have it running here with no problems, will post pointers to some
results (2.6.4 + 2.6.5rc2 + bk2 + lsm + drm lowlat patches, w and w/o
preempt). 

-- Fernando




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

[Takashi Iwai]

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

[Frank Barknecht]

Hallo,
Takashi Iwai hat gesagt: // Takashi Iwai wrote:

> At Tue, 23 Mar 2004 22:42:05 +0100,
> Frank Barknecht wrote:
> > 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.

Yes, it is loaded.

> > 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).

Maybe that is my problem. Here, /dev/midi is a link to /dev/midi0:
$ ls -l /dev/midi
lrwxrwxrwx    1 root     root           10 Jul 30  2003 /dev/midi -> /dev/midi0
$ ls -l /dev/midi0
crw-rw----    1 root     audio     14,   2 Jul 30  2003 /dev/midi0

I don't know why it is set up this way, but on another machine I can
ssh to it looks different: 

$ ls -l /dev/midi
lrwxrwxrwx    1 root     root            6 May 27  2003 /dev/midi ->
midi00
$ ls -l /dev/midi0
crw-rw-rw-    1 root     audio     35,   0 Mar 14  2003 /dev/midi0

Here I get the device number 35 for midi0, and another symlink.

Did I mess up big time?

ciao
-- 
 Frank Barknecht                               _ ______footils.org__


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

[Jaroslav Kysela]

On Tue, 23 Mar 2004, Frank Barknecht wrote:

> Hallo,
> 
> I'd like to test my system's 2.6.4 latency using Takashi's
> http://www.alsa-project.org/~iwai/latencytest-0.5.2.tar.gz
> suite. 
> 
> Building and installing so far went fine, I can run all the tests but
> no output is created. But I get a spurious error message which could be
> the reason for this. If I run "measure" by hand as it is called by
> "run_tests" like this: 
> $ 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"

Frequency should be equal or greater than 5000Hz.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs


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

[Jaroslav Kysela]

On Wed, 24 Mar 2004, Jaroslav Kysela 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"
> 
> Frequency should be equal or greater than 5000Hz.

Sorry, it appears to be the rtc frequency, of course. I was referring to
the PCM rate.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs


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