On Sat, 30 Oct 2004 11:07:40 -0400 (EDT) Alan Stern <[EMAIL PROTECTED]> wrote:
> On Sat, 30 Oct 2004, Axel Waggershauser wrote: > > > I have no sufficient knowledge of the whole scatter-gather method but I > > thought version 2 (avoiding copy_to/from_user with sg) would exactly be > > the way to go. As far as I understand it, any memory block in user-space > > may be at most fragmented into single pages so where would be that > > problem with "correct packetization" compared to the suggestion from > > Duncan of scattering single pages in kernel-space? Is the problem that > > the user-space memory block would have to be page aligned? > > (512-byte alignment would be sufficient.) That is the major part of the > problem. Another part is that user-space pages may be located in high Whould an incorrect alignment/packetization cause a real error or only hurt performance? Feyd ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
