--- charliem_1216 <> wrote:
>
> I haven't had a chance to try out your patches yet, but I did notice
> there weren't any maps matching TS7400 / TS7250 RAM layout.
I am using a TS-7260 and was able to use these patchs with minimal
changes. I don't have it right in front of me at the moment but there
was an
#if defined CONFIG_TS7400
that I had to change to:
#if defined CONFIG_TS7400 || defined CONFIG_TS72XX
or something along those lines. The memory layout appears to be the
same for the 7250, 7260 and 7400 from what I have seen (althought I
only have a 7260).
>
> I heard there may be a performance penalty using DISCONTIGRAM. If
> you
> do get a DISCONTIGRAM build up and working, can you look for a speed
> difference?
>
I can imagine it would slow things down a little but it shouldn't be
too bad. Should only cause a slowdown for memory reads/writes on a
cache or TLB miss.
But this would be an interesting thing to measure.
I am thinking once we get DISCONTIG working we should shoot for getting
SPARSEMEM working. That seems to be the direction the rest of the
linux world is going. At least that is the case on the high end where
I typically work (i.e. systems with 100GB up to 2TB RAM).
Still blows my mind that the same bits of code I use on a 256CPU 2TB
system runs on a tiny little ARM ;)
- Doug
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