Re: Early SPECWeb99 results on 2.5.33 with TSO on e1000

Manfred Spraul (manfred@colorfullife.com)
Tue, 10 Sep 2002 18:55:35 +0200

Robert Olsson wrote:
>
> Anyway. A tulip NAPI variant added mitigation when we reached "some
> load" to avoid the static interrupt delay. (Still keeping things
> pretty simple):
>
> Load "Mode"
> -------------------
> Lo 1) RxIntDelay=0
> Mid 2) RxIntDelay=fix (When we had X pkts on the RX ring)
> Hi 3) Consecutive polling. No RX interrupts.
>
Sounds good.

The difficult part is when to go from Lo to Mid. Unfortunately my tulip
card is braindead (LC82C168), but I'll try to find something usable for
benchmarking

In my tests with the winbond card, I've switched at a fixed packet rate:

< 2000 packets/sec: no delay
> 2000 packets/sec: poll rx at 0.5 ms

--
	Manfred


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