From owner-freebsd-stable  Thu Dec 13  3: 2:42 2001
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Date: Thu, 13 Dec 2001 03:02:32 -0800 (PST)
From: Matthew Dillon <dillon@apollo.backplane.com>
Message-Id: <200112131102.fBDB2WQ66827@apollo.backplane.com>
To: Thomas Zenker <thz@Lennartz-electronic.de>
Cc: stable@freebsd.org, jlemon@flugsvamp.com
Subject: Re: TCP stack still hosed?
References:  <20011213105451.A738@mezcal.tue.le>
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X-Loop: FreeBSD.ORG

    Check your kernel sources and make sure you have at least these
    versions:

  Revision    Changes    Path
    1.107.2.19  +8 -3      src/sys/netinet/tcp_input.c
    1.39.2.12   +40 -14    src/sys/netinet/tcp_output.c
    1.56.2.9    +2 -1      src/sys/netinet/tcp_var.h

    If you don't, maybe your update or build/install mechanism isn't
    working as expected.

    If you do, we need tcpdumps of the test connection.  Also, I recommend
    testing between two hosts with normal ethernet cards in them 
    (i.e. not USB) as a double-check.

					-Matt
					Matthew Dillon 
					<dillon@backplane.com>

:Hi,
:
:after making new kernels I have noticed a dramatical performance drop
:in the tcp stack.
:
:The last normally working kernel I have is from 20th november.
:The sources are up to date, our archives are updated nightly.
:
:I am using a scripted sysinstall for doing installations/updates
:on our embedded equipment. Testing the installation on a normal PC
:I can see the numbers on the speedometer :-)
:
:"host-242" is installed, the release is fetched from "mezcal".
:Both are connected to a switch 10/100TX, mezcal has a fxp running
:with 100baseTX, host-242 has a NetGear USB/ethernet adapter (10TX).
:
:Here are the numbers:
:
:1. server new, client new:	10-15 Kb/s
:mezcal:   FreeBSD 4.4-STABLE #23: Thu Dec 13 08:48:40 CET 2001
:host-242: FreeBSD 4.4-STABLE #0: Wed Dec 12 13:37:50 GMT 2001
:
:2. server old, client new:	140-160 Kb/s
:mezcal:   FreeBSD 4.4-STABLE #21: Tue Nov 20 14:17:19 CET 2001
:host-242: FreeBSD 4.4-STABLE #0: Wed Dec 12 13:37:50 GMT 2001
:
:3. server old, client old:	225-245 Kb/s
:mezcal:   FreeBSD 4.4-STABLE #21: Tue Nov 20 14:17:19 CET 2001
:host-242: FreeBSD 4.3-STABLE #0: Tue Jul 17 10:58:55 GMT 2001
:
:I have tcpdumps for all three cases. Strange are sometimes lots
:of duplicate acks.
:
:Who is interrested in the tcpdumps?
:
:Also I have tried to switch off newreno and delayed_ack, but with
:no visible effect.
:
:Thomas
:
:-- Thomas Zenker
:   c/o Lennartz electronic GmbH

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