Folkert van Heusden <[EMAIL PROTECTED]> wrote:
>
> > > What about a zero-copy read-interface?
> > > An ioctl (or something) which enables the kernel to do dma directly to
> > > the userspace. Of course this should be limited to the root-user or a
> > > user with special capabilities (rights) since
On Thu, 18 August 2005 16:34:18 -0700, dean gaudet wrote:
> On Thu, 18 Aug 2005, Folkert van Heusden wrote:
>
> > Doesn't that one also use copying? I've also heard that using mmap is
> > expensive due to pagefaulting. I've found, for example, that copying a
> > 1.3GB file using read/write instead
On Thu, 18 Aug 2005, Folkert van Heusden wrote:
> Doesn't that one also use copying? I've also heard that using mmap is
> expensive due to pagefaulting. I've found, for example, that copying a
> 1.3GB file using read/write instead of mmap & memcpy is seconds faster.
why would you memcpy if you're
On Thu, 18 August 2005 12:41:32 +0200, Folkert van Heusden wrote:
>
> > Just use mmap(). Unlike your proposal, it cooperates with the page
> > cache.
>
> Doesn't that one also use copying? I've also heard that using mmap is
> expensive due to pagefaulting. I've found, for example, that copying a
> > What about a zero-copy read-interface?
> > An ioctl (or something) which enables the kernel to do dma directly to
> > the userspace. Of course this should be limited to the root-user or a
> > user with special capabilities (rights) since if a drive screws up, data
> > from a different sector (o
On Thu, 18 August 2005 12:01:52 +0200, Folkert van Heusden wrote:
>
> What about a zero-copy read-interface?
> An ioctl (or something) which enables the kernel to do dma directly to
> the userspace. Of course this should be limited to the root-user or a
> user with special capabilities (rights) si
On Thu, Aug 18, 2005 at 12:01:52PM +0200, Folkert van Heusden wrote:
> What about a zero-copy read-interface?
> An ioctl (or something) which enables the kernel to do dma directly to
> the userspace. Of course this should be limited to the root-user or a
> user with special capabilities (rights) si
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