linux-kernel - Re: [sqlite] light weight write barriers

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Message-ID: <20121113174000.6457a68b@pyramind.ukuu.org.uk>
Date:	Tue, 13 Nov 2012 17:40:00 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Vladislav Bolkhovitin <vst@...b.net>
Cc:	Howard Chu <hyc@...as.com>,
	General Discussion of SQLite Database 
	<sqlite-users@...ite.org>, "Theodore Ts'o" <tytso@....edu>,
	drh@...ci.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [sqlite] light weight write barriers

> > Barriers are pretty much universal as you need them for power off !
> 
> I'm afraid, no storage (drives, if you like this term more) at the moment supports 
> barriers and, as far as I know the storage history, has never supported.

The ATA cache flush is a write barrier, and given you have no NV cache
visible to the controller it's the same thing.

> Instead, what storage does support in this area are:

Yes - the devil is in the detail once you go beyond simple capabilities.

Alan
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