Iptraf and 10GBE adapters

[Walter Zimmer]

Dear Iptraf Community!

I'm currently trying to monitor the amount of data flowing over
an Intel 82599EB 10GBE Ethernet adapter, which uses the ixgbe driver.

Iptraf shows me a rate of 25 MBytes per second, whereas dstat
shows about 120 MBytes/sec, which also fits other observations.

The adaptor uses TCP segment offloading where the interface gets
complete 64k chunks of data despite the MTU of 1500, so I think
iptraf might have an issue with calculating the byte rate correctly.

Or might it be some counter wrapping issue? I remember that figure
where the 10GBE counters might wrap every 1.6 seconds, which would
not match with the iptraf update rate of 5 seconds. On the other hand,
we don't have that much traffic here.

Any help would be greatly appreciated, as I would really like to use
iptraf because it is so easy to use.

Regards,
Walter
-- 
Walter Zimmer

German Aerospace Center (DLR)
Earth Observation Center (EOC)
Remote Sensing Technology Institute (IMF)
Department Atmospheric Processors (AP)

Oberpfaffenhofen
82234 Wessling

Tel.: [phone]
Fax: [phone]
email: walter.zimmer(a)dlr.de
Internet: http://www.dlr.de/eoc