On Mon, Apr 4, 2016 at 11:51 PM, Lennart Sorensen <lsore...@csclub.uwaterloo.ca> wrote: > On Mon, Apr 04, 2016 at 05:39:48PM -0300, Breno Leitao wrote: >> Ok, since we will not even have VMX, I understand that we might not need a >> POWER8, i.e, we can pursue initially with a POWER7. Does it make sense? >> >> Other than that, I will create a entry for you on one machine. But I am >> wondering if we should go with powerpc arhc other than ppc64, since I am not >> sure how stable is ppc64 right now. What is your recommendation? >> >> Also, feel free to send me your SSH pub key, so I can put on the VM. > > I am trying to think of any benefit 64bit powerpc has over 32bit other > than the memory space for the process and I don't know if there is any. > After all the architecture was designed from the begining with both 32 > and 64 bit in mind and hence I suspect they were meant to be as similar > as possible in terms of register count and such. So I suspect you gain > an increase the the process size along with the doubling of pointer size > which is usually considered a disadvantage of course (although how much > that matters depends on the application of course).
I was recently told by aurel32@d.o that ppc32 kernels do not run on a ppc64 CPU. So if one wants to run a Debian kernel [1], we are pretty much required to be running a ppc64 kernel. This is the current situation with partch.d.o. [1] https://www.debian.org/releases/jessie/powerpc/ch02s01.html.en#idp50581248
