Hi,
The limitation that you see is about the max number of packets that
FreeBSD can handle - it looks like your best performance is reached at
64 byte packets?
Am I correct that the maximum you can reach is around 639,000 packets
per second?
Also you are not routing the traffic, but instead the server handles
the requests itself and eat CPU to reply?
On Aug 3, 2009, at 11:46 AM, Invernizzi Fabrizio wrote:
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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ICQ# 24134177
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