Netra T1 105 (sparc64) optimization

[Kris Kennaway]

On Thu, Nov 30, 2006 at 05:24:43PM -0500, Miles Nordin wrote:
> >>>>> "av" == Alexandre Vieira <nullpt at gmail.com> writes:
> 
>     av> Without polling it transfers like 8MB/s, with polling it does
>     av> less than this and there is twice the latency.
> 
> that's not what i expected on both counts.
> 
> but the supposed benefit of polling is increase in pps capacity, not
> reduced latency.

sparc64 doesn't do preemption, so interrupt latency is longer than it
should be.  Presumably that is why polling helps so much.

Kris
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