[openib-general] 2.6.17 and 2.6.18 merge plans

[Shirley Ma]

Roland,

By all the data I have collected so far I think it's not a good idea to 
have while loop poll_cq() under IB hardware interrupt context. poll_cq() 
is very expensive, and it increases other hardwares' interrupt latency. If 
we move this out of hardware interrupt context, latency would be inceased 
anyway.

I have done lots of tests on splitting CQ + work queue on recv/send + 
remove tx_ring patches over mthca. Both SMP and UP unidirectional 
throughput gets improved from 20% - 75% w o/i tuning. The latency has 
increased between 4-10% on mthca. The interesting result is UP performance 
is good. I used hyperthread CPU running all these tests, don't know 
whether it's the reason.

If you think there are enough time to review these patches and have more 
chance to be merged into 2.6.17/18, I will clean and submit these patches 
ASAP, and test on ehca if none multi-threads ehca is available.

Thanks
Shirley Ma
IBM Linux Technology Center
15300 SW Koll Parkway
Beaverton, OR 97006-6063
Phone(Fax): (503) 578-7638
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