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Re: TRIM details

To: Matthias Schniedermeyer <ms@xxxxxxx>
Subject: Re: TRIM details
From: Phil Karn <karn@xxxxxxxx>
Date: Fri, 07 Jan 2011 06:15:15 -0800
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20110107091720.GA6921@xxxxxxx>
References: <4D2686ED.7000304@xxxxxxxxxxxx> <20110107091120.GA6634@xxxxxxx> <20110107091720.GA6921@xxxxxxx>
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7
On 1/7/11 1:17 AM, Matthias Schniedermeyer wrote:

> 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 
> expensive.

Doesn't even have to be a popcount. Just OR every word into a register
as the data flies by and look to see if the result is 0.

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