linux-kernel - Re: Proposal: make RAID6 code optional

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Date:	Wed, 22 Apr 2009 18:35:25 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andre Noll <maan@...temlinux.org>
CC:	Bill Davidsen <davidsen@....com>,
	Matti Aarnio <matti.aarnio@...iler.org>,
	Jesper Juhl <jj@...osbits.net>,
	Prakash Punnoor <prakash@...noor.de>,
	Michael Tokarev <mjt@....msk.ru>, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org, neilb@...e.de
Subject: Re: Proposal: make RAID6 code optional

Andre Noll wrote:
> On 11:39, H. Peter Anvin wrote:
>> Yes, I believe it would be easier than having dynamically allocated 
>> arrays.  Dynamically generated arrays using static memory allocations 
>> (bss) is one thing, but that would only reduce size of the module on 
>> disk, which I don't think anyone considers a problem.
> 
> We would save 64K of RAM in the raid5-only case if we'd defer the
> allocation of the multiplication table until the first raid6 array
> is about to be started.

Yes, and we'd have to access it through a pointer for the rest of eternity.

	-hpa

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

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