Improved copy_page() function, about 30% speed up for mpc860!
Joakim.Tjernlund at lumentis.se
Tue Mar 4 10:16:10 EST 2003
> Joakim Tjernlund wrote:
> > I found a link that may have relevance regarding the dcbz problem , can anybody confirm this?
> > http://www.uwsg.iu.edu/hypermail/linux/kernel/0012.0/0529.html
> This is just one of the many different things that happen with various
> silicon versions and the use of the cache instructions on the 8xx.
> In this particular case, we have fixed this "bug" because it affects
> other load/store instructions under some conditions (i.e. this isn't
> unique to the cache instructions).
OK so this is not it then, but what is it then? Are you 100% that
the bug(whatever this may be) is present for mpc860, rev D4 or later?
How can I make it bite me on kernel space memory?
I can't find that info in the archives, if it's there please give me a hint.
I have enabled all kernel functions that uses dcbz for 8xx as well. I even split copy_tofrom_user
into copy_from_myuser resp. copy_to_myuser and enabled dcbz in copy_from_myuser
and still everything is working just fine.
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