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Date: Mon, 18 Aug 1997 02:14:01 +0200 (CEST)
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Subject: kern/4328: Degenerate network performance
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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: