linux-kernel - RE: disk IO directly from PCI memory to block device sectors

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Date:	Fri, 26 Sep 2008 11:51:34 -0400
From:	"Leisner, Martin" <Martin.Leisner@...ox.com>
To:	"Jens Axboe" <jens.axboe@...cle.com>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Cc:	"marty" <martyleisner@...oo.com>, <linux-kernel@...r.kernel.org>
Subject: RE: disk IO directly from PCI memory to block device sectors



>   -----Original Message-----
>   From: Jens Axboe [mailto:jens.axboe@...cle.com]
>   Sent: Friday, September 26, 2008 5:12 AM
>   To: Alan Cox
>   Cc: marty; linux-kernel@...r.kernel.org; Leisner, Martin
>   Subject: Re: disk IO directly from PCI memory to block device
sectors
>   
>   On Fri, Sep 26 2008, Alan Cox wrote:
>   > > What I'm looking is for a more generic/driver independent way of
>   sticking
>   > > contents of PCI ram onto a disk.
>   >
>   > Ermm seriously why not have a userspace task with the PCI RAM
mmapped
>   > and just use write() like normal sane people do ?
>   
>   To avoid the fault and copy, I would assume.
>   
>   --
>   Jens Axboe

Also:
   a) to deal with interrupts from the hardware
   b) using legacy code/design/architecture
   
The splice approaches look very interesting...thanks...

marty
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