From owner-freebsd-stable@freebsd.org  Tue Jul 28 21:42:17 2015
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Date: Wed, 29 Jul 2015 00:42:12 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Glen Barber <gjb@FreeBSD.org>
Cc: re@FreeBSD.org, Xin Li <delphij@delphij.net>,
 freebsd-stable@freebsd.org, d@delphij.net
Subject: Re: freebsd downgrade
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On Sat, Jul 25, 2015 at 02:27:50AM +0000, Glen Barber wrote:

> On Fri, Jul 24, 2015 at 06:36:32PM +0300, Slawa Olhovchenkov wrote:
> > On Fri, Jul 24, 2015 at 08:25:55AM -0700, Navdeep Parhar wrote:
> > 
> > > On Fri, Jul 24, 2015 at 10:50:10AM +0300, Slawa Olhovchenkov wrote:
> > > > > > 
> > > > > > For me -- degradate network performance, about 30%. I am do
> > > > > > verification now, by downgrading kernel.
> > > > > 
> > > > > What kind of workload and what NIC are you using?
> > > > 
> > > > Chelsio T580-LP-CR, http serving.
> > > > r276179 can utilise 40Gbit, r281264 -- only 28Gbit.
> > > 
> > > Can you please try -RC1 when it comes out and report back if you still
> > > see degraded network performance? 
> > 
> > Now I am try revisons r276179 and compare with r281264 (for absolutly
> > clean compare -- same hardware, same configuration, same workload)
> > before this I am comare slighty different hardware (card instaled in
> > different slots) and posibly different workload.
> > After this I am try r278800 and RC1 -- one times per day.
> > 
> 
> Please try with the 10.2-RC1 that was just released, and report back.

Root of cause is BIOS setting: need ACPI NUMA to OFF.
After this change performance gain about 30%.
Sorry for false alaram.