on Thursday, December 13, 2007 6:29 PM:, Ralf Baechle wrote: > On Thu, Dec 13, 2007 at 09:07:20AM +0530, Nilanjan Roychowdhury wrote: > >> I have a scenario where two images of the same Linux kernel are >> running on two MIPS cores. One is 24K and another is 4KEC. What is >> the best way to achieve inter processor synchronization between them? >> >> I guess the locks for LL/SC are local to a particular core and can >> not be extended across a multi core system. > 4K and 24K cores don't support cache coherency. So SMP is out of > question. > This is a _total_ showstopper for SMP, don't waste your time thinking > on possible workarounds. > > The you could do is some sort of clusting, running two OS images, one > on the 4K and one on the 24K which would communicate through a > carefully cache managed or even uncached shared memory region. I guess I am left with only this option. Can you please throw some more lights On the IPC you are mentioning? >> Will it be easier for me if both of them becomes same core ( like >> both 24k) and I run the SMP version of Linux. > > > Within limits Linux supports mixing different CPU types such as > R4000MC / R4400MC and R10000 / R12000 / R14000 mixes because those > processors are similar enough > > Ralf Thanks, Nilanjan
