Test on 10GBE Intel based network card

Mon Aug 3 09:41:42 UTC 2009

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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> Fabrizio INVERNIZZI
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>
>
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--
Best Wishes,
Stefan Lambrev
ICQ# 24134177