linux-kernel - Re: [PATCH 06/13] async_tx: add support for asynchronous GF multiplication

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Message-ID: <49C53D00.9060008@zytor.com>
Date:	Sat, 21 Mar 2009 12:16:16 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ilya Yanok <yanok@...raft.com>
CC:	"H. Peter Anvin" <h.peter.anvin@...el.com>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"neilb@...e.de" <neilb@...e.de>,
	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>,
	Yuri Tikhonov <yur@...raft.com>
Subject: Re: [PATCH 06/13] async_tx: add support for asynchronous GF 	multiplication

Ilya Yanok wrote:
>>>     
>> For any n (which would mean any GF field)?  In that case, that is
>> generic scalar-vector multiplication...
>>   
> 
> Ok. I think I got it. Vectors are things that depend on position inside
> buffer and scalars are things that don't, am I right? In that sense we
> don't have any vector-vector multiplication. Both async_gen_syndrome()
> and async_pq() use constant coefficients. So I don't really understand
> the problem here.
> 

Perhaps the interface is just too confusing (in which case it needs to
at least be better documented), but at least the synchronous simulation
code looked like it was doing a vector-vector multiply.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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