Hi all
I am doing some tests on a BSD system with a 10gbe Intel based network card and
I have some doubts about the configuration since the performance I am
experiencing looks (very) poor.
This is the system I am doing test on:
- HP 380 G5 (XEON X5420, CPU speed: 2.50GHz, BUS speed: 1333 MHz, L2 cache
size: 12 MB, L2 cache speed: 2,5 GHz) with 1 quad-core installed.
- Network card: Silicom PE10G2i-LR - Dual Port Fiber (LR) 10 Gigabit Ethernet
PCI Express Server Adapter Intel® based (chip 82598EB).
Driver ixgbe-1.8.6
- FreeBSD 7.2-RELEASE (64 bit) with this options compiled in the kernel
options ZERO_COPY_SOCKETS # Turn on zero copy send
code
options HZ=1000
options BPF_JITTER
I worked on the driver settings in order to have big TX/RX rings and low
interrupt rate (traffic latency is not an issue).
In order to tune up the system i started with some echo request tests.
These are the maximum Bandwidths I can send without loss:
- 64 byte packets: 312 Mbps (1,64% CPU idle)
- 512 byte packets: 2117 Mbps (1,63% CPU idle)
- 1492 byte packets: 5525 Mbps (1,93% CPU idle)
Am I right considering these figures lower than expected?
The system is just managing network traffic!
Now I have started with netgraph tests, in particular with ng_bpf and the
overall system is going even worst.
I sent some HTTP traffic (597 bytes-long packets) and I configured an ng_bpf to
filter TCP traffic out from the incoming interface (ix0).
If I use the ngctl msg to see counters on the ng_bpf node, I see extremely poor
performance:
- Sending 96Mbps of this traffic I figured out 0.1% packet loss. This looks
very strange. May be some counter bug?
- Sending 5500Mbps, the netgraph (not the network card driver) is loosing 21%
of the number of sent packets. See below a snapshot of the CPU load under
traffic load
CPU: 0.0% user, 0.0% nice, 87.0% system, 9.1% interrupt, 3.9% idle
Mem: 16M Active, 317M Inact, 366M Wired, 108K Cache, 399M Buf, 7222M Free
Swap: 2048M Total, 2048M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
12 root 1 171 ki31 0K 16K RUN 2 20.2H 68.80% idle: cpu2
11 root 1 171 ki31 0K 16K RUN 3 20.1H 64.70% idle: cpu3
14 root 1 171 ki31 0K 16K RUN 0 20.2H 64.26% idle: cpu0
13 root 1 171 ki31 0K 16K RUN 1 20.2H 63.67% idle: cpu1
38 root 1 -68 - 0K 16K CPU1 1 1:28 34.67% ix0 rxq
40 root 1 -68 - 0K 16K CPU2 0 1:26 34.18% ix0 rxq
34 root 1 -68 - 0K 16K CPU3 3 1:27 34.08% ix0 rxq
36 root 1 -68 - 0K 16K RUN 2 1:26 34.08% ix0 rxq
33 root 1 -68 - 0K 16K WAIT 3 0:40 4.05% irq260: ix0
39 root 1 -68 - 0K 16K WAIT 2 0:41 3.96% irq263: ix0
35 root 1 -68 - 0K 16K WAIT 0 0:39 3.66% irq261: ix0
37 root 1 -68 - 0K 16K WAIT 1 0:42 3.47% irq262: ix0
16 root 1 -32 - 0K 16K WAIT 0 14:53 2.49% swi4: clock
sio
Am I missing something?
Does someone know some (more) system tuning to have higher traffic rate
supported?
Any help is greatly appreciated.
Fabrizio
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Fabrizio INVERNIZZI
Technology - TILAB
Accesso Fisso e Trasporto
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Fax +39 06 41867287
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