Date: Thu, 23 Sep 2004 06:14:54 GMT From: George Potapov <nephrite@inbox.ru> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/72022: packet loss on loopback interface Message-ID: <200409230614.i8N6Esfg085299@www.freebsd.org> Resent-Message-ID: <200409230620.i8N6KHke037283@freefall.freebsd.org>
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>Number: 72022
>Category: kern
>Synopsis: packet loss on loopback interface
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Sep 23 06:20:17 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator: George Potapov
>Release: 5.3-BETA5
>Organization:
Inline
>Environment:
FreeBSD nephrite.bm.in-line.local 5.3-BETA5 FreeBSD 5.3-BETA5 #16: Wed Sep 22 19:18:47 MSD 2004 root@nephrite.bm.in-line.local:/usr/src/sys/i386/compile/NEPHRITE i386
>Description:
when trying to send packets via loopback interface there occurs strange packet loss:
nephrite@nephrite:/usr/home/nephrite$ ping 127.0.0.1
..
--- 127.0.0.1 ping statistics ---
134 packets transmitted, 65 packets received, 51% packet loss
round-trip min/avg/max/stddev = 0.053/0.067/0.124/0.009 ms
the same for any local network services like sendmail or oops http proxy. "Real" network interfaces like my 3Com card work fine.
Here is ifconfig output:
==start==
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=9<RXCSUM,VLAN_MTU>
inet 192.168.122.164 netmask 0xffffff00 broadcast 192.168.122.255
ether 00:10:5a:b3:7f:d2
media: Ethernet 10baseT/UTP (10baseT/UTP <half-duplex>)
status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet 127.0.0.1 netmask 0xff000000
==end==
Here is my kernel config:
==start==
machine i386
cpu I486_CPU
cpu I586_CPU
cpu I686_CPU
ident NEPHRITE
options SCHED_4BSD # 4BSD scheduler
options INET # InterNETworking
options FFS # Berkeley Fast Filesystem
options SOFTUPDATES # Enable FFS soft updates support
options UFS_ACL # Support for access control lists
options UFS_DIRHASH # Improve performance on big directories
options MD_ROOT # MD is a potential root device
options NFSCLIENT # Network Filesystem Client
options MSDOSFS # MSDOS Filesystem
options CD9660 # ISO 9660 Filesystem
options PROCFS # Process filesystem (requires PSEUDOFS)
options PSEUDOFS # Pseudo-filesystem framework
options GEOM_GPT # GUID Partition Tables.
options COMPAT_43 # Compatible with BSD 4.3 [KEEP THIS!]
options COMPAT_FREEBSD4 # Compatible with FreeBSD4
options KTRACE # ktrace(1) support
options SYSVSHM # SYSV-style shared memory
options SYSVMSG # SYSV-style message queues
options SYSVSEM # SYSV-style semaphores
options _KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extension
s
options KBD_INSTALL_CDEV # install a CDEV entry in /dev
options AHC_REG_PRETTY_PRINT # Print register bitfields in debug
# output. Adds ~128k to driver.
options AHD_REG_PRETTY_PRINT # Print register bitfields in debug
# output. Adds ~215k to driver.
options ADAPTIVE_GIANT # Giant mutex is adaptive.
options ZERO_COPY_SOCKETS
options DEVICE_POLLING
options HZ=1000
# Bus support. Do not remove isa, even if you have no isa slots
device isa
device pci
# Floppy drives
device fdc
# ATA and ATAPI devices
device ata
device atadisk # ATA disk drives
device atapicd # ATAPI CDROM drives
device atapifd # ATAPI floppy drives
options ATA_STATIC_ID # Static device numbering
# atkbdc0 controls both the keyboard and the PS/2 mouse
device atkbdc # AT keyboard controller
device atkbd # AT keyboard
device vga # VGA video card driver
device splash # Splash screen and screen saver support
# syscons is the default console driver, resembling an SCO console
device sc
# Enable this for the pcvt (VT220 compatible) console driver
#device vt
#options XSERVER # support for X server on a vt console
#options FAT_CURSOR # start with block cursor
#device agp # support several AGP chipsets
# Floating point support - do not disable.
device npx
# Serial (COM) ports
device sio # 8250, 16[45]50 based serial ports
# If you've got a "dumb" serial or parallel PCI card that is
# supported by the puc(4) glue driver, uncomment the following
# line to enable it (connects to the sio and/or ppc drivers):
#device puc
# PCI Ethernet NICs that use the common MII bus controller code.
# NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
device miibus # MII bus support
device ether
device xl
# Pseudo devices.
device loop # Network loopback
device mem # Memory and kernel memory devices
device random # Entropy device
device pty # Pseudo-ttys (telnet etc)
device md # Memory "disks"
device gif # IPv6 and IPv4 tunneling
device bpf
# USB support
device uhci # UHCI PCI->USB interface
device ohci # OHCI PCI->USB interface
device usb # USB Bus (required)
#device udbp # USB Double Bulk Pipe devices
device ugen # Generic
device uhid # "Human Interface Devices"
device ukbd # Keyboard
device ulpt # Printer
device ums # Mouse
device io
==end==
and here is dmesg output
==start==
Copyright (c) 1992-2004 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD 5.3-BETA5 #16: Wed Sep 22 19:18:47 MSD 2004
root@nephrite.bm.in-line.local:/usr/src/sys/i386/compile/NEPHRITE
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Celeron(R) CPU 2.40GHz (2400.04-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf29 Stepping = 9
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,C
MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
real memory = 528416768 (503 MB)
avail memory = 511619072 (487 MB)
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Host to PCI bridge> pcibus 0 on motherboard
pir0: <PCI Interrupt Routing Table: 7 Entries> on motherboard
pci0: <PCI bus> on pcib0
$PIR: No matching entry for 0.29.INTA
$PIR: No matching entry for 0.29.INTB
$PIR: No matching entry for 0.29.INTC
$PIR: No matching entry for 0.29.INTD
pci0: <display, VGA> at device 2.0 (no driver attached)
uhci0: <Intel 82801DB (ICH4) USB controller USB-A> port 0xd800-0xd81f irq 12 at
device 29.0 on pci0
uhci0: [GIANT-LOCKED]
usb0: <Intel 82801DB (ICH4) USB controller USB-A> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
ums0: A4Tech USB Optical Mouse, rev 1.10/0.01, addr 2, iclass 3/1
ums0: 7 buttons and Z dir.
uhci1: <Intel 82801DB (ICH4) USB controller USB-B> port 0xd000-0xd01f irq 9 at d
evice 29.1 on pci0
uhci1: [GIANT-LOCKED]
usb1: <Intel 82801DB (ICH4) USB controller USB-B> on uhci1
usb1: USB revision 1.0
uhub1: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2: <Intel 82801DB (ICH4) USB controller USB-C> port 0xd400-0xd41f irq 7 at d
evice 29.2 on pci0
uhci2: [GIANT-LOCKED]
usb2: <Intel 82801DB (ICH4) USB controller USB-C> on uhci2
usb2: USB revision 1.0
uhub2: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
pci0: <serial bus, USB> at device 29.7 (no driver attached)
pcib1: <PCIBIOS PCI-PCI bridge> at device 30.0 on pci0
pci1: <PCI bus> on pcib1
xl0: <3Com 3c900B-TPO Etherlink XL> port 0xc000-0xc07f mem 0xdd000000-0xdd00007f
irq 11 at device 1.0 on pci1
xl0: selecting 10baseT transceiver, half duplex
xl0: Ethernet address: 00:10:5a:b3:7f:d2
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH4 UDMA100 controller> port 0xf000-0xf00f,0x376,0x170-0x177,0x
3f6,0x1f0-0x1f7 at device 31.1 on pci0
ata0: channel #0 on atapci0
ata1: channel #1 on atapci0
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
pci0: <multimedia, audio> at device 31.5 (no driver attached)
cpu0 on motherboard
atkbdc0: <Keyboard controller (i8042)> at port 0x64,0x60 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
fdc0: <Enhanced floppy controller> at port 0x3f0-0x3f5 irq 6 drq 2 on isa0
fdc0: [FAST]
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
unknown: <PNP0303> can't assign resources (port)
unknown: <PNP0c02> can't assign resources (port)
unknown: <PNP0501> can't assign resources (port)
unknown: <PNP0700> can't assign resources (port)
unknown: <PNP0501> can't assign resources (port)
Timecounter "TSC" frequency 2400042440 Hz quality 800
Timecounters tick every 1.000 msec
ad0: 76319MB <ST380011A/3.06> [155061/16/63] at ata0-master UDMA100
ATAPI_RESET time = 40us
acd0: CDROM <_NEC CD-ROM CD-3002A/C000> at ata1-master UDMA33
Mounting root from ufs:/dev/ad0s1a
pid 739: corrected slot count (2->1)
==end==
>How-To-Repeat:
occurs from time to time.
Just boot, enter "ping localhost" and wait, it will happen very soon.
>Fix:
not known :-(
>Release-Note:
>Audit-Trail:
>Unformatted:
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