Date: Mon, 18 Aug 1997 02:14:01 +0200 (CEST) From: tege@nada.kth.se To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/4328: Degenerate network performance Message-ID: <199708180014.CAA01957@gmp.tmg.se> Resent-Message-ID: <199708180020.RAA05976@hub.freebsd.org>
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>Number: 4328
>Category: kern
>Synopsis: Degenerate network performance
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Aug 17 17:20:01 PDT 1997
>Last-Modified:
>Originator: Torbjorn Granlund
>Organization:
TMG Datakonsult
>Release: FreeBSD 2.2.2-RELEASE i386
>Environment:
motherboard: ASUS P6NP5 (BIOS 0106)
cpu: Intel P6 200MHz w 256KB cache
memory: 128MB FPM w ECC (4x32MB)
disk: 4.4GB USCSI Fujitsu 2954 (sd0)
disk: 4.4GB UWSCSI Fujitsu 2954 (sd1)
disk: 4.4GB UWSCSI Fujitsu 2954 (sd2)
tape: 12GB/24GB DDS-1/2/3 FSCSI Sony 9000
video: ATI WinTurbo 2MB
monitor: Viewsonic 15"
network: Intel Etherexpress Pro 100B
network: DEC 21041A (10Mb/s)
The machine acts as gateway between a 100Mbps and a 10Mbps network.
(I am using a 2.2.2 kernel while the rest of the install is from 2.2.1.)
>Description:
When loading our compute server (even with a single small but CPU intensive
task), the network performance degenerates to on the order of 100 KB/s with
random delays. The machine has two network interfaces, one 100Base-T (fxp)
and one 10Base-T (de). They degenerate similarly.
Since we use the machine as a mainframe for all our development, this is a
very serious problem. Even interactive work is hampered, since the
keystrokes are sometimes echoed with an annoying delay.
>How-To-Repeat:
pro> kill -STOP 1512 # suspend CPU hog
pro> time /bin/rcp /u/tar-files/emacs-19.34.tar.gz p55:/tmp
1.49 real 0.00 user 0.37 sys
pro> kill -CONT 1512 # restart CPU hog
pro> time /bin/rcp /u/tar-files/emacs-19.34.tar.gz p55:/tmp
42.76 real 0.03 user 0.96 sys
>Fix:
None known.
>Audit-Trail:
>Unformatted:
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