Date: Mon, 07 Aug 2000 17:19:19 -0400 From: System Administrator <admin@chemcomp.com> To: freebsd-questions@freebsd.org Subject: Ethernet "long event" error frames with FBSD machines Message-ID: <398F27D7.4DB5E070@chemcomp.com>
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Hi.
I have a few FreeBSD machines installed on our local network here, and
they seem to perform very badly when doing large TCP transfers (e.g.
FTP). All machines are connected on a 10baseT/UTP network using a switch
(3Com SuperStackII Desktop Switch). But tests using nttcp give me
readings that are quite bad. The maximum bandwidth I can reach using TCP
is 1Mb/s. UDP tests are performing a lot better, giving 9 to 10Mb/s
transfers.
After investigation on the switch's console, I see that the 3 FBSD
machines that I have on the network generate "long events" error that
are described in 3com's manual as:
Late Events: This counter is incremented by one
each time a collision occurs after the valid packet
minimum time. A late event is an out- of- window
collision that may occur if your Ethernet LAN
exceeds the maximum size as defined in the IEEE
standard. A late event is also counted as a collision.
I seem to be missing something here. No other machine on our network
behave so badly. I would really like to have advice on this, because it
may be the turning point of the mere presence of FreeBSD on our network.
I cannot reproduce the behavior on any other machine that FreeBSD
machines.
What follows is the examples of the tests I ran, snapshot of the
Switch's console and my current kernel config. I run
FreeBSD sky.chemcomp.com 4.0-RELEASE FreeBSD 4.0-RELEASE #8: Mon Aug 7
12:25:44 EDT 2000 root@sky.chemcomp.com:/usr/src/sys/compile/SKY
i386
on all machines.
Thanks,
A.
--
$ nttcp -T -u earth
Bytes Real s CPU s Real-MBit/s CPU-MBit/s Calls Real-C/s
CPU-C/s
l 8388608 6.72 6.63 9.7553 9.8777 136258 20282.59
20537.1
1 8286208 7.01 0.21 9.2306 309.7061 2024 288.60
9683.1
$ nttcp -T earth
Bytes Real s CPU s Real-MBit/s CPU-MBit/s Calls Real-C/s
CPU-C/s
l 8388608 72.87 0.40 0.8994 163.4469 2048 28.11
5107.7
1 8388608 72.89 0.41 0.8991 160.3335 6121 83.98
14975.0
$
x Port ID: 10
(10BASET) x
x
x
x
x
x
x
x Bandwidth Used:
7% x
x
x
x Frames Forwarded:
100% x
x
x
x Broadcast Frame Bandwidth:
0% x
x
x
x Error Frames:
8.85% x
--------------------------------------------------------------------------------
x Port ID: 10
(10BASET) x
x
x
x
x
x
x
x CRC Align Errors:
21 x
x Short Events:
408 x
x Late Events:
424103 x
x Long Frames:
0 x
x Jabbers:
0 x
#
# GENERIC -- Generic kernel configuration file for FreeBSD/i386
#
# For more information on this file, please read the handbook section on
# Kernel Configuration Files:
#
# http://www.freebsd.org/handbook/kernelconfig-config.html
#
# The handbook is also available locally in /usr/share/doc/handbook
# if you've installed the doc distribution, otherwise always see the
# FreeBSD World Wide Web server (http://www.FreeBSD.ORG/) for the
# latest information.
#
# An exhaustive list of options and more detailed explanations of the
# device lines is also present in the ./LINT configuration file. If you
are
# in doubt as to the purpose or necessity of a line, check first in
LINT.
#
# $FreeBSD: src/sys/i386/conf/GENERIC,v 1.246 2000/03/09 16:32:55 jlemon
Exp $
machine i386
cpu I586_CPU
ident SKY
maxusers 32
options CPU_FASTER_5X86_FPU
makeoptions DEBUG=-g #Build kernel with gdb(1) debug symbols
options DDB #Kernel Debugger
options MATH_EMULATE #Support for x87 emulation
options INET #InterNETworking
#options INET6 #IPv6 communications protocols
options IPX
options FFS #Berkeley Fast Filesystem
options FFS_ROOT #FFS usable as root device [keep this!]
options MFS #Memory Filesystem
#options MD_ROOT #MD is a potential root device
options NFS #Network Filesystem
options NFS_ROOT #NFS usable as root device, NFS required
options MSDOSFS #MSDOS Filesystem
options CD9660 #ISO 9660 Filesystem
options CD9660_ROOT #CD-ROM usable as root, CD9660 required
options PROCFS #Process filesystem
options COMPAT_43 #Compatible with BSD 4.3 [KEEP THIS!]
options SCSI_DELAY=15000 #Delay (in ms) before probing SCSI
options UCONSOLE #Allow users to grab the console
options USERCONFIG #boot -c editor
options VISUAL_USERCONFIG #visual boot -c editor
options KTRACE #ktrace(1) support
options SYSVSHM #SYSV-style shared memory
options SYSVMSG #SYSV-style message queues
options SYSVSEM #SYSV-style semaphores
options P1003_1B #Posix P1003_1B real-time extentions
options _KPOSIX_PRIORITY_SCHEDULING
options ICMP_BANDLIM #Rate limit bad replies
device isa
device eisa
device pci
# Floppy drives
device fdc0 at isa? port IO_FD1 irq 6 drq 2
device fd0 at fdc0 drive 0
#device fd1 at fdc0 drive 1
# ATA and ATAPI devices
device ata0 at isa? port IO_WD1 irq 14
device ata1 at isa? port IO_WD2 irq 15
device ata
device atadisk # ATA disk drives
device atapicd # ATAPI CDROM drives
#device atapifd # ATAPI floppy drives
#device atapist # ATAPI tape drives
options ATA_STATIC_ID #Static device numbering
options ATA_ENABLE_ATAPI_DMA #Enable DMA on ATAPI devices
# SCSI Controllers
#device ahb # EISA AHA1742 family
device ahc # AHA2940 and onboard AIC7xxx devices
#device amd # AMD 53C974 (Teckram DC-390(T))
#device dpt # DPT Smartcache - See LINT for options!
#device isp # Qlogic family
#device ncr # NCR/Symbios Logic
#device sym # NCR/Symbios Logic (newer chipsets)
#device adv0 at isa?
#device adw
#device bt0 at isa?
#device aha0 at isa?
#device aic0 at isa?
# SCSI peripherals
device scbus # SCSI bus (required)
device da # Direct Access (disks)
device sa # Sequential Access (tape etc)
device cd # CD
device pass # Passthrough device (direct SCSI access)
# RAID controllers
#device ida # Compaq Smart RAID
#device amr # AMI MegaRAID
#device mlx # Mylex DAC960 family
# atkbdc0 controls both the keyboard and the PS/2 mouse
device atkbdc0 at isa? port IO_KBD
device atkbd0 at atkbdc? irq 1
device psm0 at atkbdc? irq 12
device vga0 at isa?
# splash screen/screen saver
pseudo-device splash
# syscons is the default console driver, resembling an SCO console
device sc0 at isa?
# Enable this and PCVT_FREEBSD for pcvt vt220 compatible console driver
#device vt0 at isa?
#options XSERVER # support for X server on a vt console
#options FAT_CURSOR # start with block cursor
# If you have a ThinkPAD, uncomment this along with the rest of the PCVT
lines
#options PCVT_SCANSET=2 # IBM keyboards are non-std
# Floating point support - do not disable.
device npx0 at nexus? port IO_NPX irq 13
# Power management support (see LINT for more options)
device apm0 at nexus? disable flags 0x20 # Advanced Power Management
# PCCARD (PCMCIA) support
#device card
#device pcic0 at isa? irq 10 port 0x3e0 iomem 0xd0000
#device pcic1 at isa? irq 11 port 0x3e2 iomem 0xd4000 disable
# Serial (COM) ports
device sio0 at isa? port IO_COM1 flags 0x10 irq 4
device sio1 at isa? port IO_COM2 irq 3
device sio2 at isa? disable port IO_COM3 irq 5
#device sio3 at isa? disable port IO_COM4 irq 9
# Parallel port
device ppc0 at isa? irq 7
device ppbus # Parallel port bus (required)
device lpt # Printer
device plip # TCP/IP over parallel
device ppi # Parallel port interface device
#device vpo0 # Zip, Requires scbus and da
# PCI Ethernet NICs.
#device de # DEC/Intel DC21x4x (``Tulip'')
#device fxp # Intel EtherExpress PRO/100B (82557, 82558)
#device tx # SMC 9432TX (83c170 ``EPIC'')
#device vx # 3Com 3c590, 3c595 (``Vortex'')
#device wx # Intel Gigabit Ethernet Card (``Wiseman'')
# PCI Ethernet NICs that use the common MII bus controller code.
device miibus # MII bus support
#device dc # DEC/Intel 21143 and various workalikes
#device rl # RealTek 8129/8139
#device sf # Adaptec AIC-6915 (``Starfire'')
#device sis # Silicon Integrated Systems SiS 900/SiS 7016
#device ste # Sundance ST201 (D-Link DFE-550TX)
#device tl # Texas Instruments ThunderLAN
device vr # VIA Rhine, Rhine II
#device wb # Winbond W89C840F
#device xl # 3Com 3c90x (``Boomerang'', ``Cyclone'')
# ISA Ethernet NICs.
#device ed0 at isa? port 0x280 irq 10 iomem 0xd8000
#device ex
#device ep
# WaveLAN/IEEE 802.11 wireless NICs. Note: the WaveLAN/IEEE really
# exists only as a PCMCIA device, so there is no ISA attatement needed
# and resources will always be dynamically assigned by the pccard code.
#device wi
# Aironet 4500/4800 802.11 wireless NICs. Note: the declaration below
will
# work for PCMCIA and PCI cards, as well as ISA cards set to ISA PnP
# mode (the factory default). If you set the switches on your ISA
# card for a manually chosen I/O address and IRQ, you must specify
# those paremeters here.
#device an
# The probe order of these is presently determined by
i386/isa/isa_compat.c.
#device ie0 at isa? port 0x300 irq 10 iomem 0xd0000
#device fe0 at isa? port 0x300
#device le0 at isa? port 0x300 irq 5 iomem 0xd0000
#device lnc0 at isa? port 0x280 irq 10 drq 0
#device cs0 at isa? port 0x300
#device sn0 at isa? port 0x300 irq 10
# requires PCCARD (PCMCIA) support to be activated
#device xe0 at isa?
# Pseudo devices - the number indicates how many units to allocated.
pseudo-device loop # Network loopback
pseudo-device ether # Ethernet support
#pseudo-device sl 1 # Kernel SLIP
#pseudo-device ppp 1 # Kernel PPP
pseudo-device tun # Packet tunnel.
pseudo-device pty # Pseudo-ttys (telnet etc)
pseudo-device snp 3 #Snoop device - to look at pty/vty/etc..
#pseudo-device md # Memory "disks"
#pseudo-device gif 4 # IPv6 and IPv4 tunneling
#pseudo-device faith 1 # IPv6-to-IPv4 relaying (translation)
# The `bpf' pseudo-device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
pseudo-device bpf #Berkeley packet filter
options IPFIREWALL #firewall
options IPFIREWALL_VERBOSE #print information about
# dropped packets
#options IPFIREWALL_FORWARD #enable transparent proxy
support
options IPFIREWALL_VERBOSE_LIMIT=100 #limit verbosity
#options IPFIREWALL_DEFAULT_TO_ACCEPT #allow everything by
default
#options IPV6FIREWALL #firewall for IPv6
#options IPV6FIREWALL_VERBOSE
#options IPV6FIREWALL_VERBOSE_LIMIT=100
#options IPV6FIREWALL_DEFAULT_TO_ACCEPT
options IPDIVERT #divert sockets
#options IPFILTER #ipfilter support
#options IPFILTER_LOG #ipfilter logging
#options IPSTEALTH #support for stealth forwarding
# USB support
#device uhci # UHCI PCI->USB interface
#device ohci # OHCI PCI->USB interface
#device usb # USB Bus (required)
#device ugen # Generic
#device uhid # "Human Interface Devices"
#device ukbd # Keyboard
#device ulpt # Printer
#device umass # Disks/Mass storage - Requires scbus and da
#device ums # Mouse
# USB Ethernet, requires mii
#device aue # ADMtek USB ethernet
#device cue # CATC USB ethernet
#device kue # Kawasaki LSI USB ethernet
--
Antoine Beaupre
System Administrator
Chemical Computing Group, Inc.
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