Dave Platt <[EMAIL PROTECTED]> wrote: > > I believe that the reason for not implementing raw devices on Linux was the > > fact > > that Linux was designed for x86 and the way Linux did implement DMA to > > devices > > would have made a raw device slower than a buffered device. > > I believe that your belief is entirely wrong.
So please proove... > I've used the (2.2 and 2.4) /dev/raw/* version of Linux raw devices > for several years now, to create a high-speed disk duplication system. > It runs on commodity X86 hardware, using off-the-shelf PCI-bus UDMA > IDE controllers. I've never seen /dev/raw/* on a Linux-2.4 system. I did however check the linux kernel-2.2 sources because I was trying to implement a better SCSI Generic driver that time. If the Linux kernel has been able to do user mode DMA, then there was no need to allocate a special DMA buffer inside the kernel and to use copyout (or it's Linux equivalent) later to move the data to userland. `A -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
