=>From: Mordy Ovits <[EMAIL PROTECTED]>
=>...
=>My mouse is acting funny under Linux SMP.
Could you compile & run the program below when your mouse isn't
working right? It calls gettimeofday() in a tight loop and reports
what it found once a second. You should see lines like:
Tue Oct 19 09:43:15 FWD:501936/ 0:BACK ( 0us > delta > 10860us)
Tue Oct 19 09:43:16 FWD:810266/ 0:BACK ( 0us > delta > 10809us)
If you start seeing anything besides 0 in the BACK position, or a
negative minimum delta, then we may have a similar problem. (If
you're running xntpd, turn it off and then reboot to make sure the
kernel's not doing a time adjustment.)
I'm running 2.3.18 plus Ingo Molnar's H5 patch on a 2xPIII, RH6.1,
with an ATI Mach64 card. When I use XF86, things seem to be stable,
but I also have (and would like to use) XiG's accelerated server.
When I use it, though, the mouse goes crazy after a while. (I believe
that's caused by negative time steps, but I don't know what causes the
negative steps.)
Anyway, let me know.
d.
#include <stdio.h>
#include <sys/types.h>
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
inline long
timeval_diff( const struct timeval *a, const struct timeval *b )
{
if (a->tv_sec < b->tv_sec ||
(a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec))
return -((b->tv_sec - a->tv_sec) * 1000000 + (b->tv_usec-a->tv_usec));
else
return (a->tv_sec - b->tv_sec) * 1000000 + (a->tv_usec - b->tv_usec);
}
int
main( int argc, char **argv )
{
struct timeval now;
struct timeval then;
unsigned long n_fwd = 0;
long max_fwd = 0;
unsigned long n_back = 0;
long max_back = 0;
time_t last_log = time( 0 );
gettimeofday( &then, 0 );
for ( ; ; ) {
long delta;
gettimeofday( &now, 0 );
delta = timeval_diff( &now, &then );
if (delta >= 0)
++n_fwd;
else
++n_back;
if (delta > max_fwd)
max_fwd = delta;
else
if (delta < max_back)
max_back = delta;
if (now.tv_sec >= last_log + 1) {
printf( "%.19s FWD:%6ld/%6ld:BACK (%4ldus > delta > %4ldus)\n",
ctime( &now.tv_sec ),
n_fwd, n_back, max_back, max_fwd );
n_fwd = n_back = 0;
max_fwd = max_back = 0;
last_log = now.tv_sec;
}
then = now;
}
return 0;
}
-
Linux SMP list: FIRST see FAQ at http://www.irisa.fr/prive/mentre/smp-faq/
To Unsubscribe: send "unsubscribe linux-smp" to [EMAIL PROTECTED]
