Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

Mike Galbraith
2008-09-14T06:24:54Z

On Sat, 2008-09-13 at 13:44 +0200, Mike Galbraith wrote:

> 2.6.27-rc6
> Throughput 1037.98 MB/sec 4 procs
>
> 16384 87380 1 1 60.00 80293.80
> 16384 87380 1 1 60.00 80266.60
> 16384 87380 1 1 60.00 80394.83
> 16384 87380 1 1 60.01 80397.27

<snip... sigh>

goes back to current real .27 config

Throughput 1022.52 MB/sec 4 procs

16384 87380 1 1 60.00 75941.95
16384 87380 1 1 60.01 76002.46
16384 87380 1 1 60.01 76367.55
16384 87380 1 1 60.00 76188.66

...

demodularizes seriously over-configured network

Throughput 750.175 MB/sec 4 procs

16384 87380 1 1 60.00 49270.35
16384 87380 1 1 60.01 49233.86
16384 87380 1 1 60.00 49265.72
16384 87380 1 1 60.00 49227.00

Very un-good thing to try. Stupid thing too?

-Mike