9 second ping lag unless I run tcpdump on RELENG_5

[Lenar D. Tukhvatullin]

On Thu, Oct 21, 2004 at 08:56:54AM -0600, William D. Colburn (aka Schlake) wrote:
> I have a RELENG_5 box on my desk.  Unless I run the tcpdump program, it
> responds progressively slower on the network.  This seemed like the most
> appropriate list to post this question too.
> 
> This morning, for instance, it had a 9 second ping response time from a
> machine on the same network segment as it when I came into work.  As
> soon as I typed 'tcpdump' on the freebsd box the ping time dropped to
> nearly instantaneous.  I killed tcpdump and let it run for a while.
> About a thousand seconds later it suddenly jumped to 1 second, then to 2
> seconds.  As soon as I ran tcpdump again it dropped back to normal.
> 
> The uname ids it as 5.3-STABLE #14: Wed Oct 20 10:23:11 UTC 2004,
> with a GENERIC kernel.  I did a new cvsup (along with a tcpdump because
> otherwise cvsup fails) this morning and nothing new came across.

tcpdump (by default) puts interface into promiscuous mode.
(or you can set this mode by hand: ifconfig <interface> promisc)

Maybe your ethernet card broken? Try to replace it.

--
Lenar D. Tukhvatullin