Re: problem about dma

[Fuxin Zhang <fxzhang@ict.ac.cn>]

I think that speculative loads may be the answer.
wuming wrote:

> ----- 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.
>