Performance... no more than 150 leases per second?

[Glenn Satchell]

There used to be some performance issues with large subnets due to the 
default hash sizes being a bit small. Ok for most networks, but you have 
a /15 (?) so that could show up this situation.

Don't know how whether you can change your dhcpd.conf to use a bunch of 
smaller subnets for the test.

I do know others on the list have reported >200k leases, so it is 
possible to scale. Not sure what their lease times would be, so the 
leases/second could be less than yours.

regards,
-glenn

On 05/31/10 23:24, Christian Hammers wrote:
> Hello
>
> I'm playing around with ISC dhcpd to get enough performance for a really big
> network with 60000 clients that have a very short lease time of only half an
> hour which calculates to about 33 leases per second.
>
> After starting dhcpd on a pretty decent server with lots of RAM and some
> 3GHz cores I ended up with about 100-150 leases per second.
>
> While this was more than I need I still wonder what exactly limits the
> server. dhcpd was running with 99% CPU and almost no I/O as I put the
> leases directory on /dev/shm/ (just for testing!).
>
> That server can handle 1000 MySQL queries per second and not more than
> 150 dhcpd leases (at 99% CPU!) which should be a lot easy to calculate?
>
> bye,
>
> -christian-
>
>
>
> client:/usr/local/nom/bin/dhcperf --retain-leases  --server x.x.x.x
>    --test-duration 600 --test-load 300 --clients 100000
>    --progress --discover
>
>
> server:/usr/local/src/dhcp-4.1.1# server/dhcpd -V
> Internet Systems Consortium DHCP Server 4.1.1
>
> server:/usr/local/src/dhcp-4.1.1# grep -v ^# /etc/dhcpd.conf
> default-lease-time 3600;
> max-lease-time 3600;
> ddns-update-style none;
>
> deny duplicates;
> authoritative;
> one-lease-per-client true;
>
> log-facility local6;
>
> ping-check false;
>
> key defomapi {
>     algorithm hmac-md5;
>     secret se32and6tK6xxxxxxxxx;
> };
>
> option domain-name-servers 81.173.197.16;
>
> omapi-key defomapi;
> omapi-port 7911;
>
>
> shared-network test {
> subnet 10.10.0.0 netmask 255.254.0.0 {
>     pool {
>        deny dynamic bootp clients;
>        range 10.10.0.2 10.11.255.254;
>     }
>     option bootfile-name "1.2.3.10";
>     option routers 10.10.0.1;
> }
>
> subnet 1.2.3.42 netmask 255.255.255.255 {
> }
>
> subnet 1.2.3.51 netmask 255.255.255.255 {
> }
>
> subnet 1.2.3.39 netmask 255.255.255.255 {
> }
> }
>