linux-kernel - Re: O_DIRECT question

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Message-ID: <Pine.LNX.4.64.0701110958370.3594@woody.osdl.org>
Date:	Thu, 11 Jan 2007 10:00:18 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Alan <alan@...rguk.ukuu.org.uk>
cc:	Viktor <vvp01@...ox.ru>, Aubrey <aubreylee@...il.com>,
	Hua Zhong <hzhong@...il.com>, Hugh Dickins <hugh@...itas.com>,
	linux-kernel@...r.kernel.org, hch@...radead.org,
	kenneth.w.chen@...el.com, akpm@...l.org, mjt@....msk.ru
Subject: Re: O_DIRECT question



On Thu, 11 Jan 2007, Alan wrote:
> 
> Well you can - its called SG_IO and that really does get the OS out of
> the way. O_DIRECT gets crazy when you stop using it on devices directly
> and use it on files

Well, on a raw disk, O_DIRECT is fine too, but yeah, you might as well 
use SG_IO at that point. All of my issues are all about filesystems.

And filesystems is where people use O_DIRECT most. Almost nobody puts 
their database on a partition of its own these days, afaik. Perhaps for 
benchmarking or some really high-end stuff. Not "normal users".

		Linus
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