In article <[EMAIL PROTECTED]>, James Manning wrote:
>Although I haven't digged into results, the only i960 that seems worth
>running for a RAID5 is the one (-RN I think?) with the embedded XOR
>engine. Otherwise your XOR operations will do much better on the StrongARM
>running at typically 2x the speed.
It will be far better than that in fact, fastest i960s are 99MHz
and I don't think that even the hardware XOR engine does 32bit
XORs in a single cycle. [From memory in the days when I worked at ARM]
all ARMs guaruntee to do 32bit XORs in 1 cycle, the newer chips I believe
will do XORs on blocks of data in not much more than a cycle.
So worst case the strongarm will do 910Mb/s of XORs and best case for
the i960 is 396Mb/s. From what I hear i960 development has been all
but canned and everything pumped over to strongarm - wonder why...
--
Chris Good - Dialog Corp. The Westbrook Centre, Milton Rd, Cambridge UK
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