Bounce Buffer Patch

Bounce Buffer Patch

[Sanket Rathi]

I have read about bounce buffer and understand.
but from where i can get the code of that patch and how it internally
works.

can anybody help

Thanks in advance

--- Sanket Rathi

--------------------------

Re: Bounce Buffer Patch

[Jens Axboe]

On Fri, May 17 2002, Sanket Rathi wrote:
> I have read about bounce buffer and understand.
> but from where i can get the code of that patch and how it internally
> works.

You mean the patch to avoid bounce buffering? Andrea has an uptodate
version here:

http://www.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.19pre8aa3/00_block-highmem-all-18b-11.gz

In short, it does its magic by not relying on the virtual mapping of a
given page. If you want more info than that, you'll have to ask more
qualified questions.

-- 
Jens Axboe

Re: Bounce Buffer Patch

[Sanket Rathi]

Thanks
i want to know how kernel does the job for bounce buffer.
i mean how kernel perform tasks of copying data and allocating bounce
buffer.
because if i give an address to a device for DMA then device will start
DMA from there so when kernel comes in picture i am confussed let me know
about this.

Thanks in advance


--- Sanket Rathi

--------------------------

On Fri, 17 May 2002, Jens Axboe wrote:

> On Fri, May 17 2002, Sanket Rathi wrote:
> > I have read about bounce buffer and understand.
> > but from where i can get the code of that patch and how it internally
> > works.
> 
> You mean the patch to avoid bounce buffering? Andrea has an uptodate
> version here:
> 
> http://www.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.19pre8aa3/00_block-highmem-all-18b-11.gz
> 
> In short, it does its magic by not relying on the virtual mapping of a
> given page. If you want more info than that, you'll have to ask more
> qualified questions.
> 
> -- 
> Jens Axboe
>