Hello all,

I have what may see a bizarre question. The only ARM hardware I have access to is all single core (and single socket); this includes the Efika MX.

Although I've not looked at the kernel sources yet, I'm looking to understand if anybody has seen a /proc/cpuinfo file from an ARM based system equipped with multiple CPUs or CPUs which are multi-core? It's really to determine how to count on such systems the number of cores vs. the number of sockets.

There are no multi-socket ARM systems.

root@omap4430-panda:~# cat /proc/cpuinfo
Processor : ARMv7 Processor rev 2 (v7l)
processor : 0
BogoMIPS : 2013.49

processor : 1
BogoMIPS : 1996.68

Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x1
CPU part : 0xc09
CPU revision : 2

Hardware : OMAP4430 Panda Board
Revision : 0020
Serial : 0000000000000000

That is dual core, not dual socket isn't it hrw?

_________________
Steev Klimaszewski, Genesi USA Inc.
Senior Software Engineer

This is from dualcore ARM system.

On at least some dual-core Tegra 2 systems (and on at least some Linux flavors), the second core gets shutdown when (something, somewhere) decides that doing so would save power (and that the load on the system has been light enough to justify that.) When the second core is offline, there's no entry for it in /proc/cpuinfo (so parsing that file isn't a reliable way of detecting that one's on a multicore system.)

sysconf(_SC_PROCESSORS_CONF) returns the number of configured cores and is generally an upper bound on the number of cores that can be online.