Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4

* Jie Chen <[email protected]> wrote:

> The following is pthread_sync output for 2.6.21.7-cfs-v24 #1 SMP 
> kernel.

> 2 threads:

> PARALLEL time =       11.106580 microseconds +/- 0.002460
> PARALLEL overhead =    0.617590 microseconds +/- 0.003409

> Output for Kernel 2.6.24-rc4 #1 SMP

> PARALLEL time =              19.668450 microseconds +/- 0.015782
> PARALLEL overhead =           9.157945 microseconds +/- 0.018217

ok, so the problem is that this PARALLEL time has an additional +9 usecs 
overhead, right? I dont see this myself on a Core2 CPU:

PARALLEL time =                           10.446933 microseconds +/- 0.078849
PARALLEL overhead =                       0.751732 microseconds +/- 0.177446

	Ingo
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Follow-Ups:
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
  - From: Jie Chen <[email protected]>

References:
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
  - From: Ingo Molnar <[email protected]>
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
  - From: Jie Chen <[email protected]>
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
  - From: Ingo Molnar <[email protected]>
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
  - From: Jie Chen <[email protected]>
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
  - From: Ingo Molnar <[email protected]>
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
  - From: Jie Chen <[email protected]>
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
  - From: Ingo Molnar <[email protected]>
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
  - From: Jie Chen <[email protected]>
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
  - From: Ingo Molnar <[email protected]>
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
  - From: Jie Chen <[email protected]>

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