From: Stephen Hemminger <shemminger@osdl.org>
To: Jean Delvare <jdelvare@suse.de>
Cc: netdev@vger.kernel.org
Subject: Re: Exact meaning of rx_bytes and tx_bytes
Date: Mon, 9 Oct 2006 09:22:53 -0700 [thread overview]
Message-ID: <20061009092253.6cfbd406@freekitty> (raw)
In-Reply-To: <200610091739.02361.jdelvare@suse.de>
On Mon, 9 Oct 2006 17:39:02 +0200
Jean Delvare <jdelvare@suse.de> wrote:
> Hi all,
>
> I am wondering what exactly the rx_bytes and tx_bytes values exported
> under statistics/ in sysfs are supposed to represent.
>
> Most popular ethernet drivers (8139too, e100, 3c59x) count the bytes in
> software, so they only take into account the bytes they actually send and
> receive. This excludes the 4-byte ethernet CRC if I understand correctly.
>
> Other drivers, on the other hand, get the transfered bytes statistics from
> hardware registers, and these appear to include the 4-byte CRC in the
> total count. This is the case of sk98lin and e1000, for example.
>
> So my question is, which drivers are right? Are we counting the emitted
> and received bytes at software level or at hardware level? Or do we just
> not care about the 4-byte/packet difference and both are acceptable?
>
> Thanks,
Does it really mater that much, unless you are charging people per
byte.
--
Stephen Hemminger <shemminger@osdl.org>
prev parent reply other threads:[~2006-10-09 17:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-09 15:39 Exact meaning of rx_bytes and tx_bytes Jean Delvare
2006-10-09 16:22 ` Stephen Hemminger [this message]
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