linux-ext4 - Re: "data=writeback" and TRIM don't get along

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Message-ID: <4BBDC262.7060504@gmail.com>
Date:	Thu, 08 Apr 2010 13:47:46 +0200
From:	Nebojsa Trpkovic <trx.lists@...il.com>
To:	Dmitry Monakhov <dmonakhov@...nvz.org>
CC:	Eric Sandeen <sandeen@...hat.com>, linux-ext4@...r.kernel.org
Subject: Re: "data=writeback" and TRIM don't get along

On 04/08/10 09:17, Dmitry Monakhov wrote:
> Nebojsa Trpkovic <trx.lists@...il.com> writes:
>> Intel X25-V 40GB (latest firmware)
> can you please provide an actual version of firmware.
> As soon as i know X25 zeroing was disabled.
> Can you please post an output of your queue flags 
> cat /sys/block/sdXXX/queue/discard_zeroes_data 

======================
cat /sys/block/sda/queue/discard_zeroes_data
1
cat /sys/block/sda/queue/discard_granularity
512
======================

Short history (you're probably talking about Intel's firmware problems):

- Intel releases X25-M (80 and 160GB) G1. G1 doesn't support TRIM.
- Intel releases X25-M (80 and 160GB) G2. G2's initial firmware doesn't
support TRIM.
- Intel makes TRIM-enabled firmware for G2 and publishes it.
- Customers hammer some of their G2 SSDs by flashing new firmware.
- Intel withdraws new firmware.
- Intel fixes firmware and releases new one (this time without nasty
behaviour). Read 2 updates on the start of first page:
http://www.anandtech.com/show/2865
- Intel sells it's technology to Kingston and Kingston starts to produce
40GB version of G2 named Kingston BootDrive SNV125-S2/40GB that doesn't
support TRIM. (Kingston produced some full-grown G1 and G2, but that is
not a point here. SNM125 and SNM225).
http://www.anandtech.com/show/2865/4
- Intel starts selling it's own 40GB G2 named X25-V with TRIM enabled
out of the box.
http://www.anandtech.com/show/2968/intel-s-x25-v-kingston-s-30gb-ssdnow-v-series-battle-of-the-125-ssds
- (guess) Intel needs too much royalties from Kingston for TRIM enabled
firmware, so Kingston SNV125-S2/40GB doesn't get (official) TRIM enabled
firmware and Kingston stops selling Intel-based SSDs.


Anyways, all X25-V are shipped with TRIM enabled firmware.
My current firmware is 2CV102HD.
hdparm -I /dev/sda gives this, too:
        Enabled Supported:
           *    Data Set Management TRIM supported
           *    Deterministic read ZEROs after TRIM

Nebojsa

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