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Re: [Qemu-devel] [PATCH] Improve DMA transfers by increasing the buffer
Re: [Qemu-devel] [PATCH] Improve DMA transfers by increasing the buffer size.
Sat, 29 Mar 2008 13:16:05 +0100
On Fri, Mar 28, 2008 at 05:22:30PM +0100, Aurelien Jarno wrote:
> On Fri, Mar 28, 2008 at 11:35:52AM +0000, Ian Jackson wrote:
> > Aurelien Jarno writes ("Re: [Qemu-devel] [PATCH] Improve DMA transfers by
> > increasing the buffer size."):
> > > On Wed, Mar 26, 2008 at 04:35:00PM +0000, Ian Jackson wrote:
> > > Content-Description: message body text
> > > > +#define IDE_DMA_BUF_SIZE 131072
> > >
> > > Wouldn't it be better to define this value in number of sectors? This
> > > would avoid a few divisions in the code, and anyway the code handling
> > > DMA transfers is working with a number of sectors, not a number of
> > > bytes.
> > I don't have much of an opinion about what units it should be in. The
> > divisions are just at compile-time of course.
> I agree that the generated assembly code should not be different, but
> this makes the code less readable.
> > If you prefer I'll send another version with it done in sectors :-).
> Please send it, I will commit it.
I have just done the changes myself and committed the result to the CVS.
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73
: :' : Debian developer | Electrical Engineer
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