Re: [Linux-fbdev-devel] Re: fbcon slowness [was NTP on 2.4.2?]

[<ebi...@xm...>]

Alan Cox <al...@lx...> writes:

> > > The MMX memcpy for CyrixIII and Athlon boxes is something like twice the
> > > speed of rep movs. On most pentium II/III boxes the fast paths for rep movs
> > > and for MMX are the same speed
> > 
> > As long as you are copying in real memory. So the PCI bus or the host bridge
> > implementation may be the actual limit.
> 
> The CyrixIII sits on the same host bridges as the intel processors

I don't know if it applies to this case but one thing I have seen make
a noticeable difference is whether or not write-combining is enabled.
If we have only be enabling MTRR's for intel this could do account
for it.

Eric