Burn Alting wrote:
Last year, there were discussions on this list about the possible
use of a 'co-processor' (Intel's IOP333) to compute raid 5/6's
parity data.
We are about to see low cost, multi core cpu chips with very
high speed memory bandwidth. In light of this, is there any
effective benefit to such devices as the IOP333?
Was there ever? Unless you're running on a really slow CPU, like 386,
with a TB of RAID attached, and heavy CPU load, could anyone ever see a
measureable performance gain? I haven't seen any such benchmarks,
although I haven't looked beyond reading several related mailing lists.
Or in other words, is a cheaper (power, heat, etc) cpu with
higher memory access speeds, more cost effective than a
bridge/bus device (ie hardware) solution (which typically
has much lower memory access speeds)?
An additional device is always more complex, and less tunable than a CPU
based solution. Except in the case above where there is very little CPU
available, I don't see much hope for a cost (money and complexity)
effective non-CPU solution.
Obviously my opinion only.
--
bill davidsen <davidsen@xxxxxxx>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
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