Re: performance of filesystem xattrs with Samba4

[tridge]

Andrew,

 > Is it reproducible with your tricked-up dbench?
 > 
 > If so, please send me a machine description and the relevant command line
 > and I'll do a bsearch.

I should explain a little more ....

The current dbench is showing way too much variance on this test to be
really useful. Here are the numbers for 5 runs of dbench 10 on
2.6.10-rc2 and 2.6.10-rc2-mm2:

2.6.10-rc2          325
		    320
		    364
		    360
		    347


-mm2                347
		    371
		    411
		    322
		    384

I've solved this variance problem in NBENCH by making the runs fixed
time rather than fixed number of operations, and adding a warmup
phase. I need to do the same to dbench in order to get sane numbers
out that would be at all useful for a binary patch search.

The current dbench worked OK when computers were slower, but now it is
completing its runs so fast that the noise is just silly.

Cheers, Tridge
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