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

2011-09-12 Thread Brett Glass
Here's a puzzler. I just put FreeBSD 8.1 up on an old (but good) 500 MHz Celeron with half a gig of RAM. Interfaces are classic xl (3Com) and dc (DEC tulip). Works quite nicely except for one quirk: ping times that ought to be positive (no more than 200 ms worst case) are coming out negative!

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

2011-09-12 Thread Brett Glass
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,

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

2011-09-13 Thread 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 somethin