linux-kernel - Re: [Cbe-oss-dev] [PATCH/RFC] ps3/block: Add ps3vram-ng driver for accessing video RAM as block device

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Message-ID: <49AF1B16.5000907@lanl.gov>
Date:	Wed, 04 Mar 2009 17:21:42 -0700
From:	"Marcus G. Daniels" <mdaniels@...l.gov>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jens Axboe <axboe@...nel.dk>, Jim Paris <jim@...n.com>,
	Arnd Bergmann <arnd@...db.de>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Linux/PPC Development <linuxppc-dev@...abs.org>,
	linux-mtd@...ts.infradead.org,
	Vivien Chappelier <vivien.chappelier@...e.fr>,
	Cell Broadband Engine OSS Development 
	<cbe-oss-dev@...abs.org>
Subject: Re: [Cbe-oss-dev] [PATCH/RFC] ps3/block: Add ps3vram-ng driver for
 accessing video RAM as block device

Geert Uytterhoeven wrote:
> Ideally, we think it would be best if the existing MTD-based ps3vram driver
> would be replaced by the new block-based ps3vram driver before 2.6.29 is
> released. This would relieve the burden of supporting two different swap space
> schemes on PS3 (swap on /dev/mtdblock0 vs. /dev/ps3vram) from the distro
> maintainer's shoulders, as in that case there would never have been a stable
> kernel version containing the MTD-based ps3vram driver.
> [..]
>   - ps3vram-ng is faster than ps3vram:
>       o 1 MiB blocks: +50% (read), +5% (write)
>       o 4 KiB blocks: +50% (read), +5% (write)
>       o 512 B blocks: +10% (read), +10% (write)
>   
Fwiw, it's a useful swap device, since space is so limited -- the 
performance improvements are certainly appealing too.

Marcus
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