packet drop counters?

Bill Mccormick billmcc at
Thu Jun 5 13:56:31 EDT 2008

It's mesh mode.   I'll give that a try tomorrow thanks.   Marcus also
pointed out I should double check for multiple hop routes (the fours XOs
are side by side on a bench, but best to be safe.)


-----Original Message-----
From: Javier Cardona [mailto:javier at] 
Sent: Thursday, June 05, 2008 12:48 PM
To: Mccormick, Bill (CAR:CTO2)
Cc: libertas-dev at
Subject: Re: packet drop counters?

Hi Bill,

On Thu, Jun 5, 2008 at 8:17 AM, Bill Mccormick <billmcc at>
> I'm seeing some intermittant, but fairly large bursts of packet loss 
> when I run the tests.
> For example, one scenario is I have 2 pairs of XOs.   Each pair has a
> source and a sink.
> When the sources are sending 1000 byte UDP packets at 600 packets per 
> second, I have seen up to 2000 packets dropped over a 5 second
> Most of the time it works well but once in a while I get these large 
> bursts of traffic loss.
> Are there any counters, etc. I can retrieve from the driver to help 
> debug this?

I could not infer from your e-mail whether you are testing
infrastructure or mesh mode.  If the latter, ethtool -S msh0 will give
you some additional counters on dropped frames:

# ethtool -S msh0
NIC statistics:
     drop_duplicate_bcast: 1
     drop_ttl_zero: 0
     drop_no_fwd_route: 0
     drop_no_buffers: 0
     fwded_unicast_cnt: 0
     fwded_bcast_cnt: 48
     drop_blind_table: 0
     tx_failed_cnt: 0



Javier Cardona
cozybit Inc.

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