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Date:      Tue, 06 Oct 2009 13:26:18 +0500
From:      rihad <rihad@mail.ru>
To:        Julian Elischer <julian@elischer.org>
Cc:        freebsd-net@freebsd.org, Luigi Rizzo <rizzo@iet.unipi.it>
Subject:   Re: dummynet dropping too many packets
Message-ID:  <4ACAFF2A.1000206@mail.ru>
In-Reply-To: <4ACA2CC6.70201@elischer.org>
References:  <20091005061025.GB55845@onelab2.iet.unipi.it>	<4AC9B400.9020400@mail.ru>	<20091005090102.GA70430@svzserv.kemerovo.su>	<4AC9BC5A.50902@mail.ru>	<20091005095600.GA73335@svzserv.kemerovo.su>	<4AC9CFF7.3090208@mail.ru>	<20091005110726.GA62598@onelab2.iet.unipi.it>	<4AC9D87E.7000005@mail.ru>	<20091005120418.GA63131@onelab2.iet.unipi.it>	<4AC9E29B.6080908@mail.ru>	<20091005123230.GA64167@onelab2.iet.unipi.it> <4AC9EFDF.4080302@mail.ru> <4ACA2CC6.70201@elischer.org>

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Julian Elischer wrote:
> rihad wrote:
>> Luigi Rizzo wrote:
>>> 2. your test with 'ipfw allow ip from any to any' does not
>>>    prove that the interface queue is not saturating, because
>>>    you also remove the burstiness that dummynet introduces,
>>>    and so the queue is driven differently.
>>>
>>
>> How do I investigate and fix this burstiness issue?
> 
> higher Hz rate?
> 

Rebooted with HZ=2000 10 minutes ago. Due to application design the ipfw 
  table (pipe tablearg) was flushed, so there are now 350 (and 
increasing at a rate 1 per 1-2 seconds as I type this) or so users in 
the table, and not 4k as normally would be. The box is servicing 450+ 
mbit/s without a single drop. I want to monitor how things change once 
the number of users in ipfw tables gradually increases up to several 
thousands.



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