Re: Does kernel 2.6 has some trick on Context Switch

On Fri, 18 May 2007, Pu Jiangbo wrote:

> Dear all,
> 	I've used LMBench to benchmark context switch between 2.4 and 2.6, and found an interesting thing that
> when the thread size is between 0~1024KByte, the switching time increased as everyone predicted, however, when
> bigger than 2M, it sharply decreased, like this:
> 256Kbyte/4 Processes: 47.3 ms
> 512Kbyte/4 Processes: 140.97 ms
> 1MByte/4 Processes: 142.63 ms
> 2MByte/4 Processes: 17.88 ms
> 4M----------------: 17.25 ms
> 8M----------------:	10.00 ms
> 
> when at a Linux 2.4 in the same PC:
> 512K/4P:	155.06 ms
> 1M/4P:		153.09 ms
> 2M/4P:		74.71 ms
> 4M/4P:		132.84 ms
> 8M/4P:		809.36 ms
> 
> I'm very comfused at this result, could anyone know something about that? Thank you very much!

Just out of curiosity, I wonder why you sent a message about kernel 
context-switching performance to the USB development mailing list?  
Don't you realize it is completely Off-Topic?

Alan Stern


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