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To: Werner Almesberger <Werner.Almesberger@epfl.ch>
Cc: Jeff Garzik <jgarzik@mandrakesoft.com>, netdev@oss.sgi.com,
        Linux Knernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: New net features for added performance
In-Reply-To: <3A9842DC.B42ECD7A@mandrakesoft.com> <20010225132249.J18271@almesberger.net>
From: Jes Sorensen <jes@linuxcare.com>
Date: 12 Mar 2001 16:08:47 +0100
In-Reply-To: Werner Almesberger's message of "Sun, 25 Feb 2001 13:22:49 +0100"
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>>>>> "Werner" == Werner Almesberger <Werner.Almesberger@epfl.ch> writes:

Werner> Jeff Garzik wrote:
>> 3) Slabbier packet allocation.

Werner> Hmm, this may actually be worse during bursts: if you burst
Werner> exceeds the preallocated size, you have to perform more
Werner> expensive/slower operations (e.g. running a tasklet) to refill
Werner> your cache.

You may want to look at how I did this in the acenic driver. If the
water mark goes below a certain level I schedule the tasklet, if it
gets below an urgent watermark I do the allocation in the interrupt
handler itself.

This is of course mainly useful for cards which give you deep
queues.

Jes
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