Re: TPC-C benchmark used standard RH kernel

[Martin J. Bligh]

>> This isn't as recent as I would like, but it will give you an idea.
>> Top 75 from readprofile.  This run was not using bigpages though.
>> Andy
> 
>> 00000000 total                                      7872   0.0066
>> c0105400 default_idle                               1367  21.3594
>> c012ea20 find_vma_prev                               462   2.2212
>> c0142840 create_bounce                               378   1.1250
>> c0142540 bounce_end_io_read                          332   0.9881
>> c0197740 __make_request                              256   0.1290
>> c012af20 zap_page_range                              231   0.1739
>> c012e9a0 find_vma                                    214   1.6719
>> c012e780 avl_rebalance                               160   0.4762
> 
> Looks like you're doing a lot of mmapping or faulting requiring VMA
> lookups, or the number of VMA's associated with a task makes the
> various VMA manipulations extremely expensive.
> 
> Can you dump /proc/pid/maps on some of these processes?

Isn't that the magic Oracle 32Kb mmap hack at work here, in order
to get a >2Gb SGA?

M.