Date: Mon, 5 Oct 2009 13:07:26 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: rihad <rihad@mail.ru> Cc: freebsd-net@freebsd.org, Eugene Grosbein <eugen@kuzbass.ru> Subject: Re: dummynet dropping too many packets Message-ID: <20091005110726.GA62598@onelab2.iet.unipi.it> In-Reply-To: <4AC9CFF7.3090208@mail.ru> References: <4AC8A76B.3050502@mail.ru> <20091005025521.GA52702@svzserv.kemerovo.su> <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>
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On Mon, Oct 05, 2009 at 03:52:39PM +0500, rihad wrote: > Eugene Grosbein wrote: > >On Mon, Oct 05, 2009 at 02:28:58PM +0500, rihad wrote: > > > >>Still not sure why increasing queue size as high as I want doesn't > >>completely eliminate drops. > > > >The goal is to make sources of traffic to slow down, this is the only > >way to descrease drops - any finite queue may be overhelmed with traffic. > >Taildrop does not really help with this. GRED does much better. > > > > Alright, so I changed to gred by adding to each config command: > ipfw ... gred 0.002/900/1000/0.1 queue 1000 > and reconfigured. Still around 300-400 drops per second, which was > typical at this load level before with taildrop anyway. There are around > 3-5 mbit/s being wasted according to systat -ifstat. > > Should I now increase slots to 5-10-20k? > Very strange. > > "ipfw pipe show" correctly shows that gred is at work. For example: > 00512: 512.000 Kbit/s 0 ms 1000 sl. 79 queues (64 buckets) > GRED w_q 0.001999 min_th 900 max_th 1000 max_p 0.099991 > mask: 0x00 0x00000000/0x0000 -> 0xffffffff/0x0000 > ... you keep omitting the important info i.e. whether individual pipes have drops, significant queue lenghts and so on. i am giving up!
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