From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Robert Morris <rtm@amsterdam.lcs.mit.edu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: gigabit ethernet small-packet performance
Date: Wed, 8 Nov 2000 16:23:13 +0100 [thread overview]
Message-ID: <20001108162313.C2430@pcep-jamie.cern.ch> (raw)
In-Reply-To: <200011051507.eA5F7KX30823@amsterdam.lcs.mit.edu>
In-Reply-To: <200011051507.eA5F7KX30823@amsterdam.lcs.mit.edu>; from rtm@amsterdam.lcs.mit.edu on Sun, Nov 05, 2000 at 10:07:20AM -0500
Robert Morris wrote:
> The short version is that the Intel Pro/1000 seems to be a lot faster
> than the Alteon Tigon-II or the SysKonnect card for small (60-byte)
> packets. The Intel card can send or receive at least 500,000 60-byte
> packets per second (about 1/3 of a gigabit/second). On the other hand,
> the Intel Linux driver requires a lot of hacking to achieve that rate;
> with the unmodified driver the board is about half that fast.
Fwiw, the Alteon Tigon-II can send & receive 60-byte packets at line
rate if you assemble them on the card, but I've not tried pushing that
over the PCI bus. As Jes said, that's the slow part. Special firmware
to use fewer DMAs than packets (i.e. grouping small packets) might do
the trick. The firmware kit is open source; enjoy :-)
-- Jamie
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prev parent reply other threads:[~2000-11-08 15:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-05 15:07 gigabit ethernet small-packet performance Robert Morris
2000-11-05 18:32 ` Mr. James W. Laferriere
2000-11-05 18:45 ` Gregory Maxwell
2000-11-05 21:40 ` bert hubert
2000-11-05 21:17 ` Gregory Maxwell
2000-11-07 19:44 ` Jes Sorensen
2000-11-08 15:23 ` Jamie Lokier [this message]
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