On Thu, May 24, 2012 at 12:33:11PM -0400, Bob Supnik wrote:
In sim_timer.c, locate this routine (there are several versions, look
for the last one, which is for UNIX systems):
uint32 sim_os_ms_sleep_init (void)
{
uint32 i, t1, t2, tot, tim;
for (i = 0, tot = 0; i < sleep1Samples; i++) {
t1 = sim_os_msec ();
sim_os_ms_sleep (1);
t2 = sim_os_msec ();
tot += (t2 - t1);
}
tim = (tot + (sleep1Samples - 1)) / sleep1Samples;
if (tim > SIM_IDLE_MAX)
tim = 0;
return tim;
}
If you are running with gdb, place a breakpoint on the line
if (tim > SIM_IDLE_MAX)
and see what the value of 'tim' is. Otherwise, insert the following
before the if statement:
printf ("Calculated minimum sleep time = %d\r\n", tim);
and see what gets printed out.
We seem to have a winner:
Calculated minimum sleep time = 20
After a tip from zoran at #vms, I checked the FreeBSD host clock settings:
[alver@bsd ~]$ sysctl kern.clockrate
kern.clockrate: { hz = 100, tick = 10000, profhz = 8128, stathz = 127 }
This was a tad too slow - 100 ticks per second. I changed it to 1000 ticks per
second in /boot/loader.conf:
kern.hz="1000"
After rebooting, the clockrate was adjusted to this:
[alver@bsd ~]$ sysctl kern.clockrate
kern.clockrate: { hz = 1000, tick = 1000, profhz = 8128, stathz = 127 }
And lo, behold:
Calculated minimum sleep time = 2
VAX simulator V3.9-0
sim> SHOW CPU
CPU, idle=VMS, idle enabled, stability wait = 20s, 64MB, HALT to console
So it's working as expected now.
Thanks everyone for the assistance! Now back to clustering VAXen over an
openvpn L2 link... :-)
Lennert
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