Clock speedup on 4.X FreeBSD SMP and serverworks chipset

[Martin Blapp]

Hi,

Searching the freebsd mailinglists I have seen that you also suffering
under this problem on 4.X. STABLE:

I have isolated the problem to be due reading the time with microtime()

Execute this programm:

#include <sys/types.h>
#include <sys/time.h>
#include <err.h>

int
main(void)
{

       for(;;) {
               struct timeval tv;
               struct timezone tz;
               gettimeofday(&tv, &tz);
       }
       return (0);
}

and you will see a 10% timedrift. For 20 seconds, I get 2 second
time speedup.

You should not see this time drift if you remove the gettimeofday()
syscall of the programm.

If someone has a machine where he can install CURRENT, or has a machine
with ServerWorks Chipset and SMP, is it possible that he can activate
ACPI and test it again ?

There is already a PR, PR kern/30135.

Martin

Martin Blapp, [EMAIL PROTECTED]




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