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Date: Thu, 09 Dec 2010 21:21:34 -0800
From: Julian Elischer <julian@freebsd.org>
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To: Jeremy Chadwick <freebsd@jdc.parodius.com>
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Cc: Kirk McKusick <mckusick@mckusick.com>, pjd@freebsd.org,
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Subject: Re: TRIM support for UFS?
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On 12/9/10 4:44 PM, Jeremy Chadwick wrote:
> On Thu, Dec 09, 2010 at 04:23:56PM -0800, Julian Elischer wrote:
>> On 12/9/10 2:34 AM, Kostik Belousov wrote:
>>
>> [patch]
>>
>> commit when ready.. I'm looking forwards to being able to try it out.
> And how does one actually verify TRIM is working?  Most SSDs I've used
> do not have a SMART attribute that can help determine this.  I would
> rather not make a bunch of assumptions about Attributes 226, 232, or 233
> to help give some indication of it working.
>
> For folks to test this, there needs to be some indicator/verification
> mechanism that it's working.
>
On our (fusion-io) cards we do not go via scsi or SATA so we have our 
own interfaces
which can provide all this information.. (tons of sysctls in FreeBSD..
tons of /proc entries in linux)