From: "Jörn Engel" <joern@logfs.org>
To: Jamie Lokier <jamie@shareable.org>
Cc: linux-mtd@lists.infradead.org
Subject: Re: big flash disks?
Date: Tue, 3 Jun 2008 20:09:44 +0200 [thread overview]
Message-ID: <20080603180944.GE1224@logfs.org> (raw)
In-Reply-To: <20080602123217.GA2679@shareable.org>
On Mon, 2 June 2008 13:32:18 +0100, Jamie Lokier wrote:
>
> If they can do 4k writes, and you cannot, it sounds like the SSDs you
> have used are very different to the SSDs they have used. Is that
> right?
It isn't. Their SSDs have shitty performance for 4k random writes.
That's the entire point of their product. They reorder the data,
turning random 4k writes into aligned eraseblock-sized writes. After
that reordering the performance goes way up. Iirc at least one SSD they
used must have 1MB erasesize to explain the performance boost.
Jörn
--
Audacity augments courage; hesitation, fear.
-- Publilius Syrus
next prev parent reply other threads:[~2008-06-03 18:09 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-01 18:42 big flash disks? Jamie Lokier
2008-06-01 20:41 ` Josh Boyer
2008-06-02 5:59 ` Artem Bityutskiy
2008-06-02 8:23 ` Jörn Engel
2008-06-02 10:43 ` Jamie Lokier
2008-06-02 11:55 ` Jörn Engel
2008-06-02 12:32 ` Jamie Lokier
2008-06-03 18:09 ` Jörn Engel [this message]
2008-06-03 18:44 ` Jamie Lokier
2008-06-04 6:25 ` Jörn Engel
2008-06-02 7:28 ` Jörn Engel
2008-06-02 10:41 ` Jamie Lokier
2008-06-02 11:43 ` Jörn Engel
2008-06-02 12:48 ` Jamie Lokier
2008-06-03 18:12 ` Jörn Engel
2008-06-03 18:56 ` Jamie Lokier
2008-06-04 6:18 ` Jörn Engel
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