tiomap-dev team mailing list archive

[Ricardo Salveti <rsalveti@xxxxxxxxxxxx>]

On Wed, Dec 7, 2011 at 12:44 AM, warmcat <873453@xxxxxxxxxxxxxxxxxx> wrote:
> Dave can you install Ricardo's kernel package and see if it's broken the
> same way for you.
>
> If it is, we need to diff the config from the two kernels, checking what
> modules are installed.

You can easily extract both the module list and config from my
package, but I just used the omap4_defconfig one (that I know it's
supported by you).

> If it isn't, we need to look at bootloader / rootfs differences.

Yeah, information about the image, u-boot version and so on might also
help.

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https://bugs.launchpad.net/bugs/873453

Title:
  odd timing behaviour on panda

Status in Linaro Texas Instruments Landing Team:
  Confirmed
Status in Linaro Ubuntu Evaluation Builds:
  Confirmed

Bug description:
  I've got a set of benchmarks that use clock_gettime like:

      clock_gettime(CLOCK_REALTIME, &tbefore);

      for(l=0;l<numloops;l++) {
         dostuff
      }

      clock_gettime(CLOCK_REALTIME, &tafter);

      nsdiff=(double)(tafter.tv_nsec - tbefore.tv_nsec);
      nsdiff+=1000000000.0 *(tafter.tv_sec - tbefore.tv_sec);

  
  and I've just reinstalled our local panda to using Linaro 11.09 (kernel 3.0.0-1404-linaro-lt-omap)
  and it's starting to get weird timing artifacts.

  For example:

  smarter_strlen_ldrd: ,102400, loops of ,62, bytes=6.054688 MB, transferred in ,3936768.000000 ns, giving, 1537.984331 MB/s
  smarter_strlen_ldrd: ,102400, loops of ,32, bytes=3.125000 MB, transferred in ,0.000000 ns, giving, inf MB/s
  smarter_strlen_ldrd: ,102400, loops of ,16, bytes=1.562500 MB, transferred in ,4180909.000000 ns, giving, 373.722557 MB/s

  Now there is no way that loop took 0.000000 ns!  Running the same
  binary on an older installation runs fine.

  Dave

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