Re: Processor IDs on the Niagara

[Elad Lahav <elahav@uwaterloo.ca>]

Sorry to be nagging about this...
Maybe I should have provided some motivation in the first place:
Knowing the processor topology may be of importance to a certain class of programmes. 
Specifically, I/O-intensive applications (such as a web server), may want to ensure that 
interrupts are serviced close to the process/thread executing the service. I have run some 
tests that show that servicing interrupts on a different physical package than the one 
responsible for the synchronous part of the service can result in very poor performance 
(for obvious reasons).

> Niagara T1 is a single "package", with 8 "cores".
Exactly my point. So why isn't there a single physical package ID for all CPUs under 
/sys/devices/system/cpu/cpuX/topology/physical_package_id ?

Elad