Re: New net features for added performance

[Jes Sorensen <jes@xxxxxxxxxxxxx>]

>>>>> "Werner" == Werner Almesberger <Werner.Almesberger@xxxxxxx> 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