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Cc: freebsd-net@freebsd.org, Luigi Rizzo <rizzo@iet.unipi.it>
Subject: Re: dummynet dropping too many packets
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Eugene Grosbein wrote:
> On Mon, Oct 05, 2009 at 07:30:15PM +0500, rihad wrote:
> 
>>>> How do I investigate and fix this burstiness issue?
>>> Please also show:
>>>
>>> sysctl net.isr
>>> sysctl net.inet.ip.intr_queue_maxlen
>> net.isr.swi_count: 65461359
>> net.isr.drop: 0
>> net.isr.queued: 32843752
>> net.isr.deferred: 0
>> net.isr.directed: -723075002
>> net.isr.count: -723074001
>> net.isr.direct: 1
>>
>> net.inet.ip.intr_queue_maxlen: 50
> 
> Try to increase net.inet.ip.intr_queue_maxlen uptio 4096.
> 
Apparently increasing the input queue had no effect on the output drops.
Besides, net.inet.ip.intr_queue_drops has only reached 70 for 6 days of 
uptime.

I'll soon be rebooting to change HZ 1000 -> 2000, and we'll see how that 
goes. There must be some global limit, not nmbclusters, not per-user 
output queues, not the interface input queue, but something else that 
triggers at around 360-370 mbit/s...