9 second ping lag unless I run tcpdump on RELENG_5

[William D. Colburn (aka Schlake)]

I've been running 5.3 for over a month now.  I only noticed this after
5.3-RELEASE came out.  It could be the card, I'll try to swap it and see
what happens.

On Thu, Oct 21, 2004 at 08:36:01PM +0400, Lenar D. Tukhvatullin wrote:
>Date: Thu, 21 Oct 2004 20:36:01 +0400
>From: "Lenar D. Tukhvatullin" <blackv at netroad.ru>
>To: "William D. Colburn (aka Schlake)" <wcolburn at nmt.edu>
>Cc: freebsd-net at freebsd.org
>Subject: Re: 9 second ping lag unless I run tcpdump on RELENG_5
>
>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
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--
William Colburn, "Sysprog" <wcolburn at nmt.edu>
Computer Center, New Mexico Institute of Mining and Technology
http://www.nmt.edu/tcc/     http://www.nmt.edu/~wcolburn