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Re: Some baseline tests on new hardware (was Re: [PATCH] xfs: optimise C

To: Marco Stornelli <marco.stornelli@xxxxxxxxx>
Subject: Re: Some baseline tests on new hardware (was Re: [PATCH] xfs: optimise CIL insertion during transaction commit [RFC])
From: Theodore Ts'o <tytso@xxxxxxx>
Date: Mon, 8 Jul 2013 20:56:13 -0400
Cc: Jan Kara <jack@xxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <51DAD943.6050703@xxxxxxxxx>
References: <1372657476-9241-1-git-send-email-david@xxxxxxxxxxxxx> <20130708124453.GC3438@dastard> <20130708135953.GF5988@xxxxxxxxxxxxx> <51DAD943.6050703@xxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Mon, Jul 08, 2013 at 05:22:43PM +0200, Marco Stornelli wrote:
> 
> Funny, if I well remember Google guys switched android from yaffs2
> to ext4 due to its superiority on SMP :)

The bigger reason why was because raw NAND flash doesn't really make
sense any more; especially as the feature size of flash cells has
shrunk and with the introduction of MLC and TLC, you really need to
use hardware assist to make flash sufficiently reliable.  Modern flash
storage uses dynamic adjustment of voltage levels as the flash cells
age, and error correcting codes to compensate for flash reliability
challenges.  This means accessing flash using eMMC, SATA, SAS, etc.,
and that rules out YAFFS2.

                                                - Ted

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