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

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Message-ID: <20121119115728.2d175646@notabene.brown>
Date:	Mon, 19 Nov 2012 11:57:28 +1100
From:	NeilBrown <neilb@...e.de>
To:	Jim Kukunas <james.t.kukunas@...ux.intel.com>
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, 9 Nov 2012 11:56:10 -0800 Jim Kukunas
<james.t.kukunas@...ux.intel.com> wrote:

> 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.

Thanks.  I've queued the patch up.
> 
> 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.

I might notice that if I actually looked, but it all starts swimming before
my eyes when I try :-)
If both you and hpa like it, then that is good enough for me.

Thanks,
NeilBrown


> 
> Thanks.
> 


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