SII SATA request size limit

[Marcelo Penna Guerra]

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Hi,

In recent kernels, the siimage driver limits the max kb per request size to 15 
(7.5kb). As I was having no problems with rqsize of 128 (64kb), I decided to 
comment out this part of the code and my system is rock solid.

I'm not suggesting that it should be removed, as it probably is necessary on 
other systems, but as the performance impact is huge (with 15 hdparm tests 
show an average 26mb/s and with 128 it's 47mb/s), I think the user should be 
warnned of this and there could be a option to set it to 128 in 2.6.x 
kernels, so people can try to see if it's stable. I really don't beleive that 
I have such an unique hardware configuration, so this should benefit other 
people.

Marcelo Penna Guerra
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