|[News] What a PPC linux kernel hacker thinks about the Articia||ANN.lu|
|Posted on 14-Jun-2004 23:52 GMT by JohnV||68 comments|
Here's what Benjamin Herrenschmidt, a respectable linuxPPC kernel hacker
thinks about the Articia.
is some interesting thread about the Articia. Note that Benjamin Herrenschmidt
is a clued linuxPPC kernel hacker with lot of
experience. Here's what he thinks about the Articia "features":|
It's basically incompetent northbridge design.
No, that means the HW is a Piece Of Shit !
Cache coherency is a basic feature of anything claiming to be used as a
|List of all comments to this article|
|Sorted by date, most recent at bottom|
|Comment 1||not this again...||14-Jun-2004 22:07 GMT|
|Comment 2||Joe "Floid" Kanowitz||14-Jun-2004 22:37 GMT|
|Comment 3||coldfire||14-Jun-2004 22:58 GMT|
|What a PPC linux kernel hacker thinks about the Articia : Comment 4 of 68||ANN.lu|
|Posted by Joe "Floid" Kanowitz on 14-Jun-2004 23:36 GMT|
|In reply to Comment 3 (coldfire):|
That's actually an interesting read. It appears that the "bug" is actually a feature! It appears it makes certain ways of doing things with DMA impossible and should never have been done that way on a PPC processor. Maybe they were used to dealing with X86?
I'm not entirely sure about that. It sounds like it may imply certain things can never be cached even when they should, but you'll notice, for instance, FreeBSD didn't take quite the same hit from the K7-chipset AGP misunderstanding that Linux did, for some rather subtle details of implementation.
Sounds like Mai scaled up an 'embedded' design, Linux scaled 'across' from readily available x86 desktop hardware, and now we're watching two worlds collide, while Mai's "kernel division" does appear to be MIA (if you assume they should've been the ones keeping this from becoming the ongoing PR disaster it is in the first place). Obviously everyone else's hardware is better 'tuned' to work with existing code out of the gate, but it's been impossible to gauge the impact/benefit/loss of the Articia's arrangement without knowing what the heck it really was.
|List of all comments to this article (continued)||