On Sun, 2007-02-25 at 12:11 +0200, Antti P Miettinen wrote:
> Chris Johns <chris@xxxxxxxxxxxxxxxxxxx> writes:
> > I see the same sequence that you do. Here is the specific part that
> > matches what I see. Your trace has:
>
> Hmm.. I guess I need to learn to decipher the logs. Meanwhile there's
> another log at
>
> http://www.hut.fi/~apm/usb-disconnect2.txt.gz
>
> where the disconnect should be approximately at timestamp
> 1493044489. It might be that the disconnect can be provoked by
> interrupt load. I tried whether scanning/tuning/CPU load would trigger
> the disconnect but no luck with those. The latest disconnect happened
> while I was doing a big scp from the VDR box to another machine over
> local ethernet. Might be just coincidence..
>
> Anyone have a handy way of generating interrupt load?
>
The attached C program will generate 8192 interrupts per second
using /dev/rtc. You may need to run as root or otherwise do:
# echo 8192 > /proc/sys/dev/rtc/max-user-freq
Jon
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/rtc.h>
#include <fcntl.h>
int main(int argc, char *argv[])
{
int fd = open("/dev/rtc", O_RDONLY);
long rate, fast = 8192;
if (fd < 0) {
perror("error opening /dev/rtc");
exit(1);
}
if (ioctl(fd, RTC_IRQP_READ, &rate) < 0) {
perror("error fetching rate");
exit(2);
}
printf("Current RTC IRQ rate = %ld\n", rate);
printf("New RTC IRQ rate = %ld\n", fast);
if (ioctl(fd, RTC_IRQP_SET, fast) < 0) {
perror("error setting fast rate");
exit(3);
}
if (ioctl(fd, RTC_PIE_ON, 0) < 0) {
perror("error enabling interrupts");
exit(4);
}
printf("Press enter to stop\n", fast);
getchar();
if (ioctl(fd, RTC_IRQP_SET, rate) < 0) {
perror("error setting original rate");
exit(5);
}
if (ioctl(fd, RTC_PIE_OFF, 0) < 0) {
perror("error disabling interrupts");
exit(6);
}
return 0;
}
_______________________________________________
linux-dvb mailing list
linux-dvb@xxxxxxxxxxx
http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
