[tulip] Permanent interrupt mitigation with 21143 quad card

[Donald Becker]

On Wed, 13 Nov 2002, Luke Stratman wrote:

> I recently sent an email to this list detailing my efforts to obtain
> wire speed (100 Mbps) routing with 21143 quad interface cards in several
..
> there was a way to permanently enable interrupt mitigation either

No without a minor driver change.

There is code in the parameter ioctl() call to do this, but it doesn't
actually set CSR11 with the value intended.

I will be fixing this for 0.96 (aka 1.00).

> this in the driver code, I would have to have to make changes to
> tulip_rx() and the interrupt handler to either disable the switching
> between mitigation and no-mitigation modes or (as a quick hack) just
> have it write mit_table[15] to CSR11 every time. 

Yes, that's the suggested hack.

Right now that only happens when the 21143 (only!) chip is first
overloaded. 

-- 
Donald Becker				becker@scyld.com
Scyld Computing Corporation		http://www.scyld.com
410 Severn Ave. Suite 210		Scyld Beowulf cluster system
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