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Date: Sat, 17 Oct 2009 18:20:27 -0700
From: Julian Elischer <julian@elischer.org>
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To: rihad <rihad@mail.ru>
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Cc: freebsd-net@freebsd.org, Robert Watson <rwatson@FreeBSD.org>
Subject: Re: dummynet dropping too many packets
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rihad wrote:
> Julian Elischer wrote:
>> rihad wrote:
>>
>>>>
>>> The change definitely helped! There are now more than 3200 users 
>>> online, 460-500 mbps net traffic load, and normally 10-60 (up to 150 
>>> once or twice) consistent drops per second as opposed to several 
>>> hundred up to 1000-1500 packets dropped per second before the 
>>> rebuild. What's interesting is that the drops now began only after 
>>> the ipfw table had around 3000 entries, not 2000 like before, so the 
>>> change definitely helped. Just how high can maxlen be? Should I try 
>>> 2048? 4096?
>>
>> is Hz still 4000?
>>
> No, I've set it to 2000 as per recommendations for HZ in NOTES. Should I 
> try 4000? 6000? 8000? Or maybe just increase the bce queue length and 
> rebuild? :)

you could try combinations.