Re: [PATCH 1/4] md: Factor out RAID6 algorithms into lib/

["H. Peter Anvin" <hpa@zytor.com>]

On 07/18/2009 11:52 AM, Alex Elsayed wrote:
> Alex Elsayed wrote:
> 
>> H. Peter Anvin wrote:
>>> implementation in Java, called "Jerasure".)  Implementability using real 
>>> array instruction sets is key to decent performance.
>> Actually, it is made clear in the paper that Jerasure is written as a C 
>> library, and Clearsafe is the only Java implementation. Don't let the name 
>> fool you. ;D
> And again, I make a typo. s/Clearsafe/Cleversafe/.
> 

It's still their own implementation of poor quality.  That it is poor
quality shows in the numbers, which are dramatically lower than the
actual Linux implementation -- by an order of magnitude or more.  In
other words, they build a strawman and knock it down.

The actual Linux implementation blasts any of the numbers they have in
their paper, which I presume means they haven't optimized any of them.
As such, all the numbers are meaningless.

	-hpa