linux-kernel - Re: lz4hc compression in UBIFS?

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Message-Id: <3901382977358@web14h.yandex.ru>
Date:	Mon, 28 Oct 2013 20:22:38 +0400
From:	Konstantin Tokarev <annulen@...dex.ru>
To:	Yann Collet <yann.collet.73@...il.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Brent Taylor <motobud@...il.com>,
	Artem Bityutskiy <dedekind1@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: lz4hc compression in UBIFS?



24.10.2013, 19:15, "Konstantin Tokarev" <annulen@...dex.ru>:
> Attached patch to crypto API wrapper for lz4hc seems to fix the issue. I can save
> and read files on LZ4HC-compressed volume, and I'm running on LZ4HC-compressed rootfs,
> flashed from mkfs.ubifs generated image (patch by Elie De Brauwer). My software
> works correctly.
>
> Unfortunately, on my board LZ4HC-compressed UBIFS volume performs noticeable worse
> than LZO, while still faster than zlib. I guess the reason is that CPU is no longer a
> bottleneck for my system, but NAND speed.
>
> Thank you all for your help!

Can anyone review the correctness of my patch? Looks like API of LZ4 decompressor is
used wrong way in crypto API.

-- 
Regards,
Konstantin
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