netdev - Re: difference in counters values between vlan and parent device

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Message-ID: <4A48D822.6020100@Voltaire.com>
Date:	Mon, 29 Jun 2009 18:05:06 +0300
From:	Or Gerlitz <ogerlitz@...taire.com>
To:	Patrick McHardy <kaber@...sh.net>
CC:	netdev@...r.kernel.org
Subject: Re: difference in counters values between vlan and parent device

Patrick McHardy wrote:
> So the average packet size is 56 bytes on eth1 and 42 bytes
> on eth1.4001. So the difference is 14 bytes, which is expected
> since the mac header is pulled off before delivery to the VLAN device.

yes makes sense... I am using 22 bytes for netperf payload which without VLAN produces 64=22+8+20+14 bytes frames (8 bytes for UDP header, 20 bytes for IP header, 14 bytes for Eth header). Now with vlans, how many bytes are on the wire, 78=64+14 ?


Or.
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