linux-ext4 - Re: How can btrfs take 23sec to stat 23K files from an SSD?

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Message-ID: <20120801064010.GJ12695@merlins.org>
Date:	Tue, 31 Jul 2012 23:40:10 -0700
From:	Marc MERLIN <marc@...lins.org>
To:	Chris Samuel <chris@...muel.org>
Cc:	Chris Mason <chris.mason@...ionio.com>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
	Ted Ts'o <tytso@....edu>,
	Lukáš Czerner <lczerner@...hat.com>,
	linux-ext4@...r.kernel.org, axboe@...nel.dk,
	Milan Broz <mbroz@...hat.com>
Subject: Re: How can btrfs take 23sec to stat 23K files from an SSD?

On Wed, Aug 01, 2012 at 04:36:22PM +1000, Chris Samuel wrote:
> On 01/08/12 16:01, Marc MERLIN wrote:
> 
> > Third, A freshly made ntfs filesystem through fuse is actually FASTER!
> 
> Could it be that Samsungs FTL has optimisations in it for NTFS ?
> 
> A horrible thought, but not impossible..

Not impossible, but it's can be the main reason since it clocks still 2x
slower with ntfs than a spinning disk with encrypted btrfs.
Since SSDs should "seek" 10-100x faster than spinning disks, that can't be
the only reason.

Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/  
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