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Re: problem about dma

To: <>
Subject: Re: problem about dma
From: "wuming" <>
Date: Mon, 20 Dec 2004 17:51:16 +0800
Original-recipient: rfc822;
References: <001501c4e646$7f676c00$6f64a8c0@spark> <>
----- Original Message ----- 
From: "Gleb O. Raiko" <>
To: "wuming" <>
Cc: <>
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 
arrange of memory.

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