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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