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Re: TRIM details

To: karn@xxxxxxxx
Subject: Re: TRIM details
From: Matthias Schniedermeyer <ms@xxxxxxx>
Date: Fri, 7 Jan 2011 10:17:20 +0100
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20110107091120.GA6634@xxxxxxx>
References: <4D2686ED.7000304@xxxxxxxxxxxx> <20110107091120.GA6634@xxxxxxx>
User-agent: Mutt/1.5.19 (2009-01-05)
On 07.01.2011 10:11, Matthias Schniedermeyer wrote:
> On 06.01.2011 19:22, Phil Karn wrote:
> > Just have the drive interpret an ordinary write of all 0's to any LBA as
> > an implicit "unmap" indication for that LBA. As long as the drive
> The drive would have to look into each written sector in the off chance 
> that it might be 0, that's a lot of electrons you have to burn for not 
> much gain. And that's ignoring the performance side, doing such a check 
> on each incoming write would be expensive at best.

Altough, after thinking about it a little more. Doing a Population count 
in the controller while the data comes in over the wire can't be that 

Bis denn

Real Programmers consider "what you see is what you get" to be just as 
bad a concept in Text Editors as it is in women. No, the Real Programmer
wants a "you asked for it, you got it" text editor -- complicated, 
cryptic, powerful, unforgiving, dangerous.

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