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.

>
> 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.