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

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Date:	Fri, 19 Nov 2010 10:30:38 -0500
From:	Mark Lord <kernel@...savvy.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	Chris Mason <chris.mason@...cle.com>,
	James Bottomley <james.bottomley@...e.de>,
	Matthew Wilcox <matthew@....cx>,
	Josef Bacik <josef@...hat.com>,
	Lukas Czerner <lczerner@...hat.com>, tytso <tytso@....edu>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	sandeen <sandeen@...hat.com>
Subject: Re: [PATCH 1/2] fs: Do not dispatch FITRIM through separate super_operation

On 10-11-19 09:57 AM, Christoph Hellwig wrote:
> On Fri, Nov 19, 2010 at 09:53:52AM -0500, Mark Lord wrote:
>> On 10-11-19 09:40 AM, Chris Mason wrote:
>>>
>>> We've been told that online and constant trimming is the default in
>>> windows7.   The ssds are most likely to just start ignoring the trims
>>> they can't service efficiently.
>>
>> Win7 collects multiple TRIM ranges over time and batches them as single TRIMs
>> (as reported to me by an SSD vendor who traced it with a SATA analyzer,
>>   and who also apparently has "inside info").
>
> I really hate to rely on this third party hearsay (from all sides), and
> have implement TRIM support in qemu now.  I'll soon install win7 and
> will check out the TRIM patters myself.

Here is some of the heresay about Win7:

   TRIM commands are sent when:
      -- About 2/3 of partition is filled up, when file is (really) deleted,
           not when merely sending file to trash bin.
      -- In the above case, when trash bin gets emptied.
      -- In the above case, when partition is deleted.

So the behaviour may vary, depending upon how full the filesystem is
at any point in time.

Cheers
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