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Re: problem about dma

To: <linux-mips@linux-mips.org>
Subject: Re: problem about dma
From: "wuming" <wuming@ict.ac.cn>
Date: Mon, 20 Dec 2004 17:51:16 +0800
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <001501c4e646$7f676c00$6f64a8c0@spark> <41C690CF.2010306@niisi.msk.ru>
Sender: linux-mips-bounce@linux-mips.org
----- Original Message ----- 
From: "Gleb O. Raiko" <raiko@niisi.msk.ru>
To: "wuming" <wuming@ict.ac.cn>
Cc: <linux-mips@linux-mips.org>
Sent: Monday, December 20, 2004 4:43 PM
Subject: Re: problem about dma


> In 2.4, memcpy's prefetch may (and, in practice, do, no smiles, it cost 
> me a lot of time to realize) access that memory. I though it has been 
> fixed in 2.6 someday.
> 
> Regards,
> Gleb.
> 
Thank you! :)
But I think it is not the only reason, because the CPU on my platform does not 
support the "pref" instruction. So, memcpy's prefetch may have no effect on 
that 
arrange of memory.

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