linux-ext4 - Re: [PATCH 1/2] fs: Do not dispatch FITRIM through separate super

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Date:	Fri, 26 Nov 2010 08:49:01 -0500
From:	Mark Lord <kernel@...savvy.com>
To:	Greg Freemyer <greg.freemyer@...il.com>
CC:	Ted Ts'o <tytso@....edu>, Lukas Czerner <lczerner@...hat.com>,
	Steven Whitehouse <swhiteho@...hat.com>,
	James Bottomley <James.Bottomley@...e.de>,
	Christoph Hellwig <hch@...radead.org>,
	Matthew Wilcox <matthew@....cx>,
	Josef Bacik <josef@...hat.com>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	sandeen@...hat.com
Subject: Re: [PATCH 1/2] fs: Do not dispatch FITRIM through separate super_operation

On 10-11-25 11:24 AM, Greg Freemyer wrote:
>
> I'm away from my systems today, but is there an easy way to tweak
> wiper.sh or hdparm to cause only a single range per trim command.
>
> I'm curious if for the Sandforce that would still be in the 90 second
> range, or closer to 64x that.

Good question.  The Indilinx based drives would be in the 64x range,
no doubt there.  But I don't know about the Sandforce.

And I don't think I'm willing to inflict so many life-shortening erase
cycles onto it just to find out.

One thing to note:  the execution time for TRIM does vary depending upon
whether the (logical) LBAs are already mostly in a "trimmed" state or not.

So anyone aspiring to benchmark this stuff will need to keep that in mind.
My timings above were for "already trimmed" cases.  I would expect them
to be much slower (2x - 3x) if the sectors all held data prior to trim.

Cheers
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