On Mon, 15 Dec 2003 14:17:29 -0800 "David S. Miller" <davem@xxxxxxxxxx> wrote:
| On Mon, 15 Dec 2003 12:03:58 -0800
| Ben Greear <greearb@xxxxxxxxxxxxxxx> wrote:
|
| > Is there an agreed upon standard for exactly what ethernet drivers
| > should be counting for rx-bytes and tx-bytes? For example, should the
| > counters include the 4-byte FCS? Should they include the ethernet header?
|
| Good question.
|
| It should be that all drivers use what skb->len ends up with at
| rx/tx time.
|
| However, it is often faster to just let the hardware keep track
| of these statistics (tg3 is one example of a chip that can do
| this). And sometimes these mechanisms take the FCS or whatever
| into account and this as you note makes the numbers different.
RFC 1573:
RFC 2233:
RFC 1213:
all agree that on an "interface" the number of octets received (InOctets)
is:
The total number of octets received on the interface, including
framing characters.
so I read that as including MAC headers and FCS. Without reading
these, I would have said include MAC headers but not FCS.
Similar for OutOctets.
--
~Randy
MOTD: Always include version info.
|