Shares with strange ACL settings
Corinna Vinschen
corinna-cygwin@cygwin.com
Mon Aug 17 09:03:00 GMT 2015
On Aug 17 08:27, Achim Gratz wrote:
> Achim Gratz <Stromeko <at> nexgo.de> writes:
> > The output is correct now for a SandyBridge dual-core CPU with
> > logical processors (aka HT) and an IvyBridge dual-core CPU w/o HT.
>
> Another IvyBridge dual-core w/ HT looks also correct.
>
> However, for the Piledriver Opteron 6328 in the 2012R2 server, Cygwin
> reports 8 cores. Linux on the other hand would report 8 processors on 4
> cores (SMT, like HT on Intel). I don't know where you get the topology
> information from,
The code is loosly based on what the Linux kernel does, combined with
the information given in
http://wiki.osdev.org/Detecting_CPU_Topology_%2880x86%29
So on AMD the topo is taken from cpuids 0x80000008 and 0x00000001,
but I may have made a mistake there.
[...digging...]
Oh, ok. It seems I accidentally dropped a piece of code there. Can you
do me a favor and run the following test application? I just need the
value your Piledrive CPU returns in ecx returned by cpuid 0x80000008:
========================================================================
#include <stdio.h>
#include <stdint.h>
static inline void __attribute ((always_inline))
cpuid (uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d,
uint32_t ain, uint32_t cin)
{
asm volatile ("cpuid"
: "=a" (*a), "=b" (*b), "=c" (*c), "=d" (*d)
: "a" (ain), "c" (cin));
}
int
main ()
{
uint32_t eax, ebx, ecx, edx;
cpuid (&eax, &ebx, &ecx, &edx, 0x80000008, 0);
printf ("0x80000008 %08x %08x %08x %08x\n", eax, ebx, ecx, edx);
}
========================================================================
Thanks,
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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