PostgreSQL performance on FreeBSD
asomers at freebsd.org
Fri Jun 3 17:29:15 UTC 2016
On Fri, Jun 3, 2016 at 11:26 AM, Konstantin Belousov
<kostikbel at gmail.com> wrote:
> On Fri, Jun 03, 2016 at 09:29:16AM -0600, Alan Somers wrote:
>> I notice that, with the exception of the VM_PHYSSEG_MAX change, these
>> patches never made it into head or ports. Are they unsuitable for low
>> core-count machines, or is there some other reason not to commit them?
>> If not, what would it take to get these into 11.0 or 11.1 ?
> The fast page fault handler was redesigned and committed in r269728
> and r270011 (with several follow-ups).
> Instead of lock-less buffer queues iterators, Jeff changed buffer allocator
> to use uma, see r289279. Other improvement to the buffer cache was
> committed as r267255.
> What was not committed is the aggressive pre-population of the phys objects
> mem queue, and a knob to further split NUMA domains into smaller domains.
> The later change is rotten.
> In fact, I think that with that load, what you would see right now on
> HEAD, is the contention on vm_page_queue_free_mtx. There are plans to
> handle it.
Thanks for the update. Is it still recommended to enable the
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