Diagnosing packet loss

Gary Gatten Ggatten at waddell.com
Tue Nov 22 21:15:28 UTC 2011

Well, 1% is not good but I've seen worse for sure!  Sounds like you tried the obvious.  I would recommend a different IP to rule out a dupe ip; else it must be NIC related - either hardware or driver.  Also, perhaps swap cables and ports with a working machine and see if the problem follows or stays put.

----- Original Message -----
From: Kees Jan Koster [mailto:kjkoster at gmail.com]
Sent: Tuesday, November 22, 2011 02:33 PM
To: freebsd-questions at freebsd.org <freebsd-questions at freebsd.org>
Subject: Diagnosing packet loss

Dear All,

I am stuck with a machine that shows serious packet loss (about 1% of all traffic is dropped). I tried the obvious (new network cable, different switch port, different ethernet interface on the machine), but the problems remain.

Another machine that sits in the same rack and is hooked up to the same switch shows no such packet loss issues. The problematic machine is a dual Opteron with FreeBSD 8.2-STABLE from Thu Aug 11 14:05:47 CEST 2011.

The machine is lightly loaded. A MySQL slave is running, but the machine is not serving queries. Plus a Munin server process.

I am at a loss where to start diagnosing this. Can you advise me where to look? Are there network buffers that may be overflowing?
Kees Jan

kjkoster at kjkoster.org

Change is good. Granted, it is good in retrospect, but change is good.

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