freebsd stable - Mar 2017 - about that DFBSD performance test

Hi.

Some have probably seen this already - 
http://lists.dragonflybsd.org/pipermail/users/2017-March/313254.html

So, could anyone explain why FreeBSD was owned that much. Test is split  
into two parts, one is nginx part, and the other is the IPv4 forwarding 
part. I understand that nginx ownage was due to SO_REUSEPORT feature, 
which we do formally have, but in DFBSD and Linux it does provide a 
kernel socket multiplexor, which eliminates locking, and ours does not. 
I have only found traces of discussion that DFBSD implementation is too 
hackish. Well, hackish or not, but it's 4 times faster, as it turns out. 
The IPv4 forwarding loss is pure defeat though.

Please not that although they use HEAD it these tests, they also mention 
that this is the GENERIC-NODEBUG kernel which means this isn't related 
to the WITNESS stuff.

Please also don't consider this trolling, I'm a big FreeBSD fan through 
the years, so I'm asking because I'm kind of concerned.

Eugene.

On Wed, Mar 08, 2017 at 09:00:34AM +0500, Eugene M. Zheganin wrote:
> Hi.
> 
> Some have probably seen this already - 
> http://lists.dragonflybsd.org/pipermail/users/2017-March/313254.html
> 
> So, could anyone explain why FreeBSD was owned that much. Test is split  
> into two parts, one is nginx part, and the other is the IPv4 forwarding 
three: UFS part. And multiple simulations access to same file/block
can cause page lock congestion.
> part. I understand that nginx ownage was due to SO_REUSEPORT feature, 
> which we do formally have, but in DFBSD and Linux it does provide a 
> kernel socket multiplexor, which eliminates locking, and ours does not. 
> I have only found traces of discussion that DFBSD implementation is too 
> hackish. Well, hackish or not, but it's 4 times faster, as it turns
out.
> The IPv4 forwarding loss is pure defeat though.
> 
> Please not that although they use HEAD it these tests, they also mention 
> that this is the GENERIC-NODEBUG kernel which means this isn't related 
> to the WITNESS stuff.
> 
> Please also don't consider this trolling, I'm a big FreeBSD fan
through
> the years, so I'm asking because I'm kind of concerned.