linux-kernel - Re: [PATCH] lib/raid6: Add AVX2 optimized recovery functions

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Message-ID: <20121109195610.GA2928@jtkukuna_gentoo_sb.jf.intel.com>
Date:	Fri, 9 Nov 2012 11:56:10 -0800
From:	Jim Kukunas <james.t.kukunas@...ux.intel.com>
To:	NeilBrown <neilb@...e.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Paul Menzel <pm.debian@...glemail.com>,
	Linux Raid <linux-raid@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] lib/raid6: Add AVX2 optimized recovery functions

On Fri, Nov 09, 2012 at 10:50:25PM +1100, Neil Brown wrote:
> On Fri, 09 Nov 2012 12:39:05 +0100 "H. Peter Anvin" <hpa@...or.com> wrote:
> 
> > Sorry, we cannot share those at this time since the hardwarenis not yet released.
> 
> Can I take that to imply "Acked-by: "H. Peter Anvin" <hpa@...or.com>" ??
> 
> It would be nice to have at least a statement like:
>  These patches have been tested both with the user-space testing tool and in 
>  a RAID6 md array and the pass all test.  While we cannot release performance
>  numbers as the hardwere is not released, we can confirm that on that hardware
>  the performance with these patches is faster than without.
> 
> I guess I should be able to assume that - surely the patches would not be
> posted if it were not true...  But I like to avoid assuming when I can.

Hi Neil,

That assumption is correct. The patch was tested and benchmarked before submission.

You'll notice that this code is very similar to the SSSE3-optimized
recovery routines I wrote earlier. This implementation extends that same
algorithm from 128-bit registers to 256-bit registers.

Thanks.

-- 
Jim Kukunas
Intel Open Source Technology Center

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