PVE kernel limits outgoing connections

[hanzfritz85]

All my servers with PVE kernel enabled show poor outgoing connections performance:

ab -n 10000 -c 1000 example.url

4.4.21-1-pve
Requests per second: 679.38

4.4.35-1-pve
Requests per second: 754.42

4.13.13-5-pve
Requests per second: 692.04

4.13.13-6-pve
Requests per second: 651.42

4.15.18-9-pve
Requests per second: 721.59

which is actually about ~140 concurrent connections instead of expected 1000

Those I've missed to swicth to PVE kernel are showing far higher result

4.9.87-xxxx-std-ipv6-64
Requests per second: 6152.71

4.9.33-mod-std-ipv6-64
Requests per second: 7969.25

which looks like ok.
is this an expected behavior?

note: no tuning has been done on all machines, except "nofiles" which is the same on all machines

 

[Richard]

All my servers with PVE kernel enabled show poor outgoing connections performance:

ab -n 10000 -c 1000 example.url

4.4.21-1-pve
Requests per second: 679.38

4.4.35-1-pve
Requests per second: 754.42

4.13.13-5-pve
Requests per second: 692.04

4.13.13-6-pve
Requests per second: 651.42

4.15.18-9-pve
Requests per second: 721.59

which is actually about ~140 concurrent connections instead of expected 1000

Those I've missed to swicth to PVE kernel are showing far higher result

4.9.87-xxxx-std-ipv6-64
Requests per second: 6152.71

4.9.33-mod-std-ipv6-64
Requests per second: 7969.25

which looks like ok.
is this an expected behavior?

note: no tuning has been done on all machines, except "nofiles" which is the same on all machines

The results depend on network as well as on the destination's reaction time. In case of ideal conditions I've got > 10.000 connected from a machine with pve kernel.

 

[hanzfritz85]

The results depend on network as well as on the destination's reaction time. In case of ideal conditions I've got > 10.000 connected from a machine with pve kernel.

sure it is. but it's not the case: it's minimum 1Gbps on all of these servers. and 1Gbps can handle much more that 1000 concurrent connections. also as you can notice that values are almost similar for all pve kernels.

 

[hanzfritz85]

The results depend on network as well as on the destination's reaction time. In case of ideal conditions I've got > 10.000 connected from a machine with pve kernel.

what is the pve kernel version you are talking about?

 

[hanzfritz85]

Dear All,
can you please check your pve installation?
uname -r
&
ab -n 10000 -c 1000 example.url

 

[Richard]

what is the pve kernel version you are talking about?

Latest: 4.15.18-9