tiomap-dev team mailing list archive

[Ricardo Salveti <rsalveti@xxxxxxxxxxxx>]

The package from current 3.1 tilt-linux-linaro:
http://people.linaro.org/~rsalveti/873453/

Still no luck with it:

 CLOCK_REALTIME tsdiff=126373291.000000 ns (1322122264/661772965 -> 1322122264/535399674
 gettimeofday tvdiff=126373.000000 us (1322122264/661772 -> 1322122264/535399
result=0.225014
 CLOCK_REALTIME tsdiff=54077149.000000 ns (1322122264/720031022 -> 1322122264/665953873
 gettimeofday tvdiff=54078.000000 us (1322122264/720031 -> 1322122264/665953
result=0.225014
 CLOCK_REALTIME tsdiff=130584722.000000 ns (1322122264/927123307 -> 1322122264/796538585
 gettimeofday tvdiff=130585.000000 us (1322122264/927123 -> 1322122264/796538
result=0.225014

Time to test the current tilt-tracking one.

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Developers, which is subscribed to linaro-landing-team-ti.
https://bugs.launchpad.net/bugs/873453

Title:
  odd timing behaviour on panda

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

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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