linux-kernel - Re: Approaches to making io

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Message-ID: <20110902131057.GA7779@infradead.org>
Date:	Fri, 2 Sep 2011 09:10:57 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Ted Ts'o <tytso@....edu>, Dave Chinner <david@...morbit.com>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Daniel Ehrenberg <dehrenberg@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Approaches to making io_submit not block

On Fri, Sep 02, 2011 at 09:08:35AM -0400, Ted Ts'o wrote:
> That may be true for hard drives, but PCIe attached flash can support
> millions of IOP's per second --- i.e., at least hundreds of IOP's in
> milliseconds.  Yes, these devices are expensive, but so are the
> thousand-disk RAID arrays that some people attach via XFS.  :-)

reading / writing to the devices is different from allocator calls.

You reall do not want to do an allocator call for each of these device.

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