On Mon, Jan 08, 2024 at 01:26:18PM +0100, Florian Obser wrote:

> On 2024-01-08 13:22 +01, Otto Moerbeek <otto@drijf.net> wrote:
> > On Mon, Jan 08, 2024 at 01:02:24PM +0100, Otto Moerbeek wrote:
> >
> >> On Mon, Jan 08, 2024 at 11:25:18AM +0100, Florian Obser wrote:
> >> 
> >> > On 2024-01-05 23:06 +01, Alexander Bluhm <alexander.bluhm@gmx.net> wrote:
> >> > > Hi,
> >> > >
> >> > > Sending UDP packets via datagram socket is MP safe now.  Same applies
> >> > > to raw IPv4 and IPv6, and divert sockets.  Switch sosend() from
> >> > > exclusive net lock to shared net lock in combination with per socket
> >> > > lock.  TCP and GRE still use exclusive net lock.
> >> > >
> >> > > Please test this diff if you have applications that run multithreaded
> >> > > and send lots of UDP packets.
> >> > 
> >> > So I ran dnsbench and things do not look good.
> >> 
> >> I ran my tests wit pdns_recursor and dnsperf using 10 clients on
> >> another machine (which is running debian). That might explain why I
> >> did not spot a performance regression.
> 
> I'm doing the same thing, including debian ;)
> 
> >> 
> >> 	-Otto
> >
> > Specifically, I'm running dnsperf against a pdns recursor that is Lua
> > scripted to sends NODATA response for any query. So no upstream
> > traffic occurs, only query-answer.  rec is running with 1 thread
> > reading queries and 4 threads answering.
> 
> for some reason nsd is unhappy.

Do you see the queries being distributed over all nsd instances?

	-Otto
> 
> >
> > Patched code is much faster (amd64, on a 8 core machine).
> >
> > 	-Otto
> >
> > Current:
> >
> > Statistics:
> >
> >   Queries sent:         2165838
> >   Queries completed:    2164720 (99.95%)
> >   Queries lost:         1118 (0.05%)
> >
> >   Response codes:       NOERROR 2164720 (100.00%)
> >   Average packet size:  request 38, response 38
> >   Run time (s):         60.008196
> >   Queries per second:   36073.738994
> >
> >   Average Latency (s):  0.000233 (min 0.000111, max 0.008237)
> >   Latency StdDev (s):   0.000043
> >
> > Patched:
> >
> > Statistics:
> >
> >   Queries sent:         12873279
> >   Queries completed:    12873046 (100.00%)
> >   Queries lost:         233 (0.00%)
> >
> >   Response codes:       NOERROR 12873046 (100.00%)
> >   Average packet size:  request 38, response 38
> >   Run time (s):         60.039529
> >   Queries per second:   214409.510108
> >
> >   Average Latency (s):  0.000356 (min 0.000133, max 0.039529)
> >   Latency StdDev (s):   0.000049
> >
> 
> -- 
> In my defence, I have been left unsupervised.