Re: [dpdk-dev] Sporadic errors while initializing NICs in example applications, dpdk-1.5.0r1

[Dmitry Vyal <dmitryvyal@gmail.com>]

On 11/29/2013 04:39 PM, Thomas Monjalon wrote:
> 29/11/2013 13:25, Thomas Monjalon :
>
> Please check that your hardware do not support invariant TSC.
> It would explain why you need to fix frequency.
>
> I attach a simple code to test CPU feature "Invariant TSC".

I compiled and ran the code on all the platforms I had troubles on. 
Invariant TSC is supported everywhere.

> It seems that the file is stripped on the mailing-list.
> Code inlined:
>
> #include <stdlib.h>
> #include <stdio.h>
> #include <unistd.h>
> #include <stdint.h>
>
>
> int main()
> {
>      uint32_t a = 0x80000000;
>      uint32_t b, d;
>
>      __asm__("cpuid;"
>              :"=a"(b)
>              :"0"(a));
>
>      if (b >= 0x80000007) {
>
>          a = 0x80000007;
>          __asm__("cpuid;"
>                  :"=a"(b), "=d"(d)
>                  :"0"(a));
>
>          if (d & (1<<8)) {
>              printf("Invariant TSC is supported\n");
>          } else{
>              printf("Invariant TSC is NOT supported\n");
>          }
>      } else {
>          printf("No support for Advanced Power Management Information in
> CPUID\n");
>      }
>      return 0;
> }
>