Re: [Lse-tech] Minutes from LSE Con Call

[<rw...@ea...>]

> 6. Randy Hron - Trying to determine which patch causes an
> improvement in pipe throughput. Believe it is due to
> irq balancing. 

The 2.4.19-pre10-jam2 patches are identified:

irqrate lowers pipe latency measured by LMbench on SMP.
irqbalance lowers AF_UNIX latency.

> However on a networking benchmark Andrew
> Theurer saw a 10% decrease with the irq balancing patch.
> Randy will try it on different workloads if he determines
> it is the patch that causes the improvement.

I'm running my usual set of tests on 2.4.19pre10aa2 +
irqrate and irqbalance.  (pre10aa2 was the basis for jam2)

netperf is very configurable and is likely to be a valueable
addition to the things I run.  It would be helpful to know more 
about the testing configuration and method that had a netperf 
regression.  

I.E.
how many processors in box?
how many samples?
networked or loopback?

If there was a script that ran the tests, that would help a lot.

-- 
Randy Hron
http://home.earthlink.net/~rwhron/kernel/bigbox.html