Oliver Herold wrote:
Are there any numbers or technical papers? Just out of curiosity.

I ran a mysql benchmark against Dragonfly-current and FreeBSD 7 on an 8-core machine (one of the workloads that FreeBSD now performs very well at) and found 0 scaling on dragonfly. Their developers confirmed that the kernel is still entirely giant locked (as in FreeBSD 4) so no SMP performance benefits are possible.

The email thread is here:


although the linked graph is offline. The FreeBSD curve was essentially this one (FreeBSD has improved further since then):


with dragonfly a flat line at ~500 tps independent of load.


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