From: Lennert Buytenhek <buytenh@wantstofly.org>
To: "David S. Miller" <davem@davemloft.net>
Cc: rl@hellgate.ch, netdev@oss.sgi.com
Subject: Re: via-rhine unable to send back-to-back packets?
Date: Tue, 30 Nov 2004 07:48:23 +0100 [thread overview]
Message-ID: <20041130064823.GA27872@xi.wantstofly.org> (raw)
In-Reply-To: <20041129172540.6b959858.davem@davemloft.net>
On Mon, Nov 29, 2004 at 05:25:40PM -0800, David S. Miller wrote:
> > For example, when transmitting 300-byte packets, I can TX 38261 packets
> > per second, but I should be able to TX ~38580. When doing the math, it
> > turns out that 38261 is exactly the number of 302-byte packets you can
> > stuff into Fast Ethernet per second.
>
> Is the packet length in those calculations taking into consideration
> the CRC et al. bytes that the card adds to the packet?
Yeah, preamble (8 bytes), CRC (4 bytes), inter-packet gap (12 bytes).
Perhaps the via-rhine simply can't send out packets back-to-back and
needs 14 byte times of inter-packet gap. I couldn't find any stray +2
in the driver anywhere but I'm just checking.
next prev parent reply other threads:[~2004-11-30 6:48 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-29 22:27 via-rhine unable to send back-to-back packets? Lennert Buytenhek
2004-11-30 1:25 ` David S. Miller
2004-11-30 6:48 ` Lennert Buytenhek [this message]
2004-11-30 17:41 ` Ben Greear
2004-12-01 19:55 ` Lennert Buytenhek
2004-11-30 20:25 ` David S. Miller
2004-11-30 22:06 ` Roger Luethi
2004-12-01 20:01 ` Lennert Buytenhek
2004-12-02 11:01 ` Roger Luethi
2004-12-02 11:09 ` Lennert Buytenhek
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