Date: Mon, 30 Jun 2003 17:14:56 +0800 (HKT) From: ktso@cuhk.edu.hk To: FreeBSD-gnats-submit@FreeBSD.org Cc: ktso@cuhk.edu.hk Subject: kern/53920: sluggish TCP connection Message-ID: <200306300914.h5U9EuD1006625@chameleon.itsc.cuhk.edu.hk> Resent-Message-ID: <200306300920.h5U9KK8e095841@freefall.freebsd.org>
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>Number: 53920
>Category: kern
>Synopsis: sluggish TCP connection
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Jun 30 02:20:19 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator: KT So
>Release: FreeBSD 5.1-RELEASE i386
>Organization:
ITSC, CUHK
>Environment:
System: FreeBSD chameleon.itsc.cuhk.edu.hk 5.1-RELEASE FreeBSD 5.1-RELEASE #0: Thu Jun 5 02:55:42 GMT 2003 root@wv1u.btc.adaptec.com:/usr/obj/usr/src/sys/GENERIC i386
Dell Poweredge 2650 with builtin Broadcom GE NIC
>Description:
The FreeBSD server 137.189.192.36 is connected to Internet using the builtin Broadcom GE NIC. So, the bge driver is used. We are running an INN server and we used another news server to feed a large batch of old news into it. We notice that the TCP connection is sometimes sluggish. Further investigation showed that the machine is still pingable and new TCP connection can be established when those existing TCP connection become sluggish for a few seconds. You may have a look at the attached tcpdump file. I have telnet to the remote host 137.189.192.36 from 137.189.28.103. I have tried to type the string "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrst" when the TCP connection is sluggish. Those characters "abcdef..." are not echoed immediately. However, ACK was sent immediately after each character is received by the remote host. When the news feeding is stopped, the TCP connections were no longer sluggish. We have similar problem in FreeBSD 4.5. The problem was m!
ore serious and we can find messages like "watchdog timeout" from the log.
>How-To-Repeat:
Feed a batch of news articles to the FreeBSD server with Broadcom GE NIC. Then monitor any TCP connection like SSH, telnet, etc. Sometimes the problem does not exist after the machine is warmed up. After a reboot, the problem happen again.
>Fix:
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end
>Release-Note:
>Audit-Trail:
>Unformatted:
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