linux-kernel - AW: [PATCH 0/4] Add AVX512 optimized gen

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Message-ID: <12EF8D94C6F8734FB2FF37B9FBEDD1739B81A7C6@EXCHANGE.collogia.de>
Date:	Wed, 3 Aug 2016 05:44:03 +0000
From:	Markus Stockhausen <stockhausen@...logia.de>
To:	Gayatri Kammela <gayatri.kammela@...el.com>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>
CC:	"shli@...nel.org" <shli@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"james.t.kukunas@...ux.intel.com" <james.t.kukunas@...ux.intel.com>,
	"fenghua.yu@...el.com" <fenghua.yu@...el.com>,
	"megha.dey@...ux.intel.com" <megha.dey@...ux.intel.com>,
	"ravi.v.shankar@...el.com" <ravi.v.shankar@...el.com>
Subject: AW: [PATCH 0/4] Add AVX512 optimized gen_syndrome and recovery
 functions

> Von: linux-raid-owner@...r.kernel.org [linux-raid-owner@...r.kernel.org]&quot; im Auftrag von &quot;Gayatri Kammela [gayatri.kammela@...el.com]
> Gesendet: Mittwoch, 3. August 2016 01:28
> An: linux-raid@...r.kernel.org
> Cc: shli@...nel.org; linux-kernel@...r.kernel.org; hpa@...or.com; james.t.kukunas@...ux.intel.com; fenghua.yu@...el.com; megha.dey@...ux.intel.com; ravi.v.shankar@...el.com; Gayatri Kammela
> Betreff: [PATCH 0/4] Add AVX512 optimized gen_syndrome and recovery functions
> 
> This is the patch set for adding AVX512 optimized gen_syndrome
> and recovery functions.
> 
> Optimization of RAID6 using AVX512 instructions should improve the
> RAID6 performance.These patches are tested and observed the improvement
> in performance.

Hi Gayatri,

as you already implemented the gen_syndrome() functions it should be a piece
of cake to add the xor_syndrome() ones. Only if these are implemented we can
make use of Read-Modify-Write operations if the kernel chooses an processor 
optimized algorithm. They are already in the SSE2 path but are still missing from 
the current AVX2 implementation.

More infos here:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fe5cbc6e06c7d8b3a86f6f5491d74766bb5c2827
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a582564b24bec0443b5c5ff43ee6d1258f8bd658
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0e833e697bcf4c2f3f7fb9fce39d08cd4439e5d7

It would give the final touch to the patches.

Best regards.

Markus

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