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Date:      Thu, 11 Aug 2005 19:00:36 +0300
From:      Volodya Pelekh <>
Subject:   Problem with dummynet
Message-ID:  <>

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I have problem with dummynet in FreeBSD 5.4
When i create any(10Mbit/s) pipe for my any host in local network, delay for this host
rise from 1-3 ms to 15-20 ms, freebsd 5.3 i have not see something

pings before i add pipes
PING ( 56 data bytes
64 bytes from icmp_seq=0 ttl=125 time=2.314 ms
64 bytes from icmp_seq=1 ttl=125 time=3.506 ms
--- ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 2.314/2.910/3.506/0.596 ms

ipfw pipe 3 config bw 10Mbit/s queue 3MB
ipfw pipe 4 config bw 10Mbit/s queue 3MB

ipfw a 3 pipe 4 ip from to me
ipfw a 3 pipe 3 ip from me to

pings after i add pipes

PING ( 56 data bytes
64 bytes from icmp_seq=0 ttl=125 time=13.902 ms
64 bytes from icmp_seq=1 ttl=125 time=19.183 ms
64 bytes from icmp_seq=2 ttl=125 time=19.651 ms
64 bytes from icmp_seq=3 ttl=125 time=19.891 ms
64 bytes from icmp_seq=4 ttl=125 time=19.458 ms
--- ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max/stddev = 13.902/18.417/19.891/2.269 ms

My Kernel

achine         i386
cpu             I686_CPU
ident           AERO

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         NFSSERVER               # Network Filesystem Server
options         NFS_ROOT                # NFS usable as /, requires NFSCLIENT
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         SCSI_DELAY=15000        # Delay (in ms) before probing SCSI
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 extensions
options         KBD_INSTALL_CDEV        # install a CDEV entry in /dev
options         ADAPTIVE_GIANT          # Giant mutex is adaptive.

device          apic                    # I/O APIC

options         VM_KMEM_SIZE_SCALE="1"

options         IPFIREWALL
options         IPFIREWALL_FORWARD
options         IPFIREWALL_VERBOSE
options         IPFIREWALL_VERBOSE_LIMIT=300

options         IPDIVERT
options         DUMMYNET

options         NETGRAPH
options         NETGRAPH_ETHER
options         NETGRAPH_PPPOE
options         NETGRAPH_SOCKET
options         NETGRAPH_TEE

options         IPFILTER
options         IPFILTER_LOG

options         DEVICE_POLLING
options         TCPDEBUG
options         TCP_DROP_SYNFIN

device          isa
device          pci

device          fdc

device          ata
device          atadisk         # ATA disk drives
device          ataraid         # ATA RAID drives
device          atapicd         # ATAPI CDROM drives
options         ATA_STATIC_ID   # Static device numbering

device          atkbdc          # AT keyboard controller
device          atkbd           # AT keyboard
device          vga             # VGA video card driver
device          splash          # Splash screen and screen saver support
device          sc
device          agp             # support several AGP chipsets
device          npx
device          pmtimer

device          cbb             # cardbus (yenta) bridge
device          pccard          # PC Card (16-bit) bus
device          cardbus         # CardBus (32-bit) bus

# Serial (COM) ports
device          sio             # 8250, 16[45]50 based serial ports

device          miibus          # MII bus support
device          fxp             # Intel EtherExpress PRO/100B (82557, 82558)
device          rl              # RealTek 8129/8139
device          tl              # Texas Instruments ThunderLAN
device          xl              # 3Com 3c90x (``Boomerang'', ``Cyclone'')

device          loop            # Network loopback
device          mem             # Memory and kernel memory devices
device          io              # I/O device
device          random          # Entropy device
device          ether           # Ethernet support
device          ppp             # Kernel PPP
device          tun             # Packet tunnel.
device          pty             # Pseudo-ttys (telnet etc)
device          md              # Memory "disks"
device          bpf             # Berkeley packet filter

Sorry for my English
Wait for answer

Volodymyr Pelekh           Tel: +38 0322 97 91 16

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