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Date:      Mon, 1 Jun 1998 04:44:15 +0300
From:      "Vladimir A. Jakovenko" <vovik@ntu-kpi.kiev.ua>
To:        freebsd-stable@FreeBSD.ORG
Subject:   network performance problems
Message-ID:  <19980601044415.09340@NTU-KPI.Kiev.UA>

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Hi!

 We have a lots of FreeBSD based routers in our network, and after upgrade
 to 2.2.6-RELEASE we reach problems with some of them.

 Sometimes intensive-loaded interfaces refuse to work, and when I try to ping
 some hosts throw affected interface I got 'no buffer space available', with 
 mbuf usage (according to netstat -m) no more then 60%.  

 In most cases problem affect routers with interfaces working on different 
 speeds:

 phbme -- ed0, ed1, ed2 -- NE2000 clones working on 10Mb/s,
	  de0 -- DEC-based working on 100Mb/s

 ptf --   ed0 -- NE2000 clone working on 10Mb/s,
	  de0 -- DEC-based working on 10Mb/s,
	  sl0 -- slip interface working on 115.2Kb/s (no hardware flow control).
	  
 but sometimes it also affect routers with interfaces working on the same
 speed (also 2.2.6-RELEASE).

 All hosts kernels are builded with 'maxusers 64'.

-- 
Regards,
Vladimir.

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