Packet loss with traffic shaper and routing

[Lee Johnston]

Hi,

Try using device polling to reduce the number of interrupts.

Add this to your kernel:
options         DEVICE_POLLING
options         HZ=1000

And set sysctl kern.polling.enable=1

Hope this helps,

Regards,
Lee.





tpeixoto at widesoft.com.br wrote:
> Hello all!
>
> We have a machine working as a router and bandwidth limiter for our
> network. It routes the traffic through two 'bge' interfaces utilizing only
> public IPs. No NAT is used. We only have IPFW rules for traffic shaping by
> MAC addresses.
> It works fine, but we have been experiencing high latency and packet loss.
> There is no other major services in this machine, cpu utilization is low,
> memory is fine, no disk activity, but load average is always around 1.5 or
> 2, even if I disable IPFW layer 2 filtering.
> Network traffic is not greater than 12 Mbit/s.
>
> The system is a FreeBSD 5.4-RELEASE, running on a dual CPU: Intel(R)
> Xeon(TM) CPU 3.06GHz (3051.47-MHz 686-class CPU) compiled with SMP kernel:
>  cpu0 (BSP): APIC ID:  0
>  cpu1 (AP): APIC ID:  1
>  cpu2 (AP): APIC ID:  6
>  cpu3 (AP): APIC ID:  7
>
>
> top output:
>
> last pid: 14039;  load averages:  1.61,  1.62,  1.56
> 37 processes:  1 running, 35 sleeping, 1 zombie
> CPU states:  0.0% user,  0.0% nice,  1.4% system, 30.8% interrupt, 67.8% idle
> Mem: 16M Active, 421M Inact, 149M Wired, 688K Cache, 112M Buf, 1417M Free
> Swap: 1024M Total, 1024M Free
>
>   PID USERNAME PRI NICE   SIZE    RES STATE  C   TIME   WCPU    CPU COMMAND
>  6245 root      96    0  2672K  2236K select 2   3:48  0.00%  0.00% dhcpd
>   329 root      96    0  1328K   892K select 0   2:48  0.00%  0.00% syslogd
>   453 root      96    0  3384K  2508K select 2   0:33  0.00%  0.00% sshd
>
>
>
>
> systat -iostat output:
>
>                     /0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10
>      Load Average   ||||||||||
>
>           /0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100
> cpu  user|
>      nice|
>    system|
> interrupt|XXXXXXXXXXXXXXXXX
>      idle|XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
>           /0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100
> da0   MB/s
>       tps|X
> pass0 MB/s
>       tps|
>
>
> Can anyone give me some advice?
> Thank you in advance!
>
>
> _______________________________________________
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>
>
>   


-- 
------------------------------------------------------------------------
Wildcard Internet - end-to-end internet solutions
Lee Johnston - Wildcard Internet
Tel: 0845 165 1510
Fax: 0845 165 1511
Email: lee at wildcard.net.uk <mailto:lee at wildcard.net.uk>
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