which CPU for XOR?

which CPU for XOR?

[Dexter Filmore]

What type of operation is XOR anyway? Should be ALU, right?
So - what CPU is best for software raid? One with high integer processing 
power? 

Dex


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Re: which CPU for XOR?

[H. Peter Anvin]

Followup to:  <200606091349.24109.Dexter.Filmore@gmx.de>
By author:    Dexter Filmore <Dexter.Filmore@gmx.de>
In newsgroup: linux.dev.raid
>
> What type of operation is XOR anyway? Should be ALU, right?
> So - what CPU is best for software raid? One with high integer processing 
> power? 
> 

Something with massive wide vector registers.

PowerPC with Altivec totally kicks ass; x86-64 isn't too bad either.

There are also some processors with builtin RAID accelerators; at
least Intel, Broadcom and AMCC make them.

	-hpa

Re: which CPU for XOR?

[Bill Davidsen]

Dexter Filmore wrote:

>What type of operation is XOR anyway? Should be ALU, right?
>So - what CPU is best for software raid? One with high integer processing 
>power? 
>
Unless you're running really low on CPU, it probably doesn't matter... 
you run out of memory bandwidth on large data (larger than cache) 
anyway. That's my take on it.

-- 
bill davidsen <davidsen@tmr.com>
  CTO TMR Associates, Inc
  Doing interesting things with small computers since 1979