Hello,
On Mon, Mar 21, 2011 at 01:24:37PM -0400, Chris Mason wrote:
> Very interesting. Ok, I'll definitely rerun my benchmarks as well. I
> used dbench extensively during the initial tuning, but you're forcing
> the memory low in order to force IO.
>
> This case doesn't really hammer on the locks, it hammers on the
> transition from spinning to blocking. We want also want to compare
> dbench entirely in ram, which will hammer on the spinning portion.
Here's re-run of DFL and SIMPLE with the memory restriction lifted.
Memory is 4GiB and disk remains mostly idle with all CPUs running
full.
USER SYSTEM SIRQ CXTSW THROUGHPUT
DFL 59898 504517 377 6814245 782.295
SIMPLE 61090 493441 457 1631688 827.751
So, about the same picture.
Thanks.
--
tejun
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