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Hello Julian,
Thanks for your answers. I still need a bit of explanations on the
Fast Ethernet network :)
> I tought that FastEthernet was limited to about 8000 packets per seconds.
> How is it possible,
8000*1500bytes
Now check with 60-byte SYN packets. Then with X-byte UDP packets
where X is your average packet size
For example, you mean that you can put 25 "60 bytes SYN packets"
into one Ethernet frame? So you have about 8000*25 = 200'000 SYN
packets/s? Are you sure? :)
Each Ethernet frame has already the source and destination MAC
address, and I don't think you can put multiple layer 3 packets in one
layer 2 packet.
> even with 2 NICs, to reach 110'000 SYN packets per seconds? Is the testlvs
> program run
> directly on the LVS box?
No, many client hosts runing testlvs. One 600MHz may be can
generate 40-50K packets/sec. Run it on 2-3 client hosts. The RS only
drops after accounting.
I have only 1 client (PIII 500, 128MB RAM), but I can't send more than
about 2000 SYN packets/s, with peaks at 8000 (reported on the director
by show_traffic.sh).
Can the syncookie mechanism "slow down" the connection reception
rate?
> How to bypass this limitation? Gigabit Ethernet cards/network?
100mbit
My network is already at 100Mbps :)
This load is difficult to measure. You can run the following
commands in 2 different terminals on the director, at the same time:
1> vmstat 1
2> vmstat 10
If they show big difference, then you are near the limits
I'll try that tomorrow.
Thanks for all,
Fabrice Bucher
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