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From: Robert Olsson <Robert.Olsson@data.slu.se>
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Date: Wed, 11 Sep 2002 09:46:45 +0200
To: Manfred Spraul <manfred@colorfullife.com>
Cc: Robert Olsson <Robert.Olsson@data.slu.se>,
       "David S. Miller" <davem@redhat.com>, haveblue@us.ibm.com,
       hadi@cyberus.ca, netdev@oss.sgi.com, linux-kernel@vger.kernel.org
Subject: Re: Early SPECWeb99 results on 2.5.33 with TSO on e1000
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 >  > 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.

Manfred Spraul writes:

 > 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

 21143 for tulip's. Well any NIC with "RxIntDelay"  should do.

 > 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

 I was experimenting with all sorts of moving averages but never got a good 
 correlation with bursty network traffic as this level of resolution. The 
 only measure I found fast and simple enough for this was the number of 
 packets on the RX ring as I mentioned.


 Cheers.
						--ro
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