Negative ping times with FreeBSD 8.1-RELEASE on older Celeron system

[John Baldwin]

On Monday, September 12, 2011 5:53:39 pm Brett Glass wrote:
> More information regarding the odd behavior I'm seeing. Turns out
> that packets do not even need to leave the machine for it to
> report large negative ping times, on the order of more than half
> a second. (See below.) Clearly something is odd about timekeeping
> in this system (SiS motherboard chipset, PII-generation Celeron
> but still effectively a "686") which was not a problem when it was
> running FreeBSD 4.11-RELEASE (as it was before). Any ideas?

4.x didn't support the ACPI timer.

I would look at the kern.timecounter sysctls.  Maybe try forcing it to use the 
TSC.

-- 
John Baldwin