GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  VALE (4)

NAME

vale - a very fast Virtual Local Ethernet using the netmap API

CONTENTS

Synopsis
Description
Operation
     Limits
Sysctl Variables
Examples
See Also
Authors

SYNOPSIS


.Cd device netmap

DESCRIPTION

vale is a feature of the netmap(4) module that implements multiple Virtual switches that can be used to interconnect netmap clients, including traffic sources and sinks, packet forwarders, userspace firewalls, and so on.

vale is implemented completely in software, and is extremely fast. On a modern machine it can move almost 20 Million packets per second (Mpps) per core with small frames, and about 70 Gbit/s with 1500 byte frames.

OPERATION

vale dynamically creates switches and ports as clients connect to it using the netmap(4) API.

vale ports are named vale[bdg:][port] where vale is the prefix indicating a VALE switch rather than a standard interface, bdg indicates a specific switch (the colon is a separator), and port indicates a port within the switch. Bridge and port names are arbitrary strings, the only constraint being that the full name must fit within 16 characters.

See netmap(4) for details on the API.

    LIMITS

vale currently supports up to 4 switches, 16 ports per switch, with 1024 buffers per port. These hard limits will be changed to sysctl variables in future releases.

SYSCTL VARIABLES

vale uses the following sysctl variables to control operation:
dev.netmap.bridge The maximum number of packets processed internally in each iteration. Defaults to 1024, use lower values to trade latency with throughput.

dev.netmap.verbose
  Set to non-zero values to enable in-kernel diagnostics.

EXAMPLES

Create one switch, with a traffic generator connected to one port, and a netmap-enabled tcpdump instance on another port:
tcpdump -ni vale-a:1 &
pkt-gen  -i vale-a:0 -f tx &

Create two switches, each connected to two qemu machines on different ports.

qemu -net nic -net netmap,ifname=vale-1:a ... &
qemu -net nic -net netmap,ifname=vale-1:b ... &
qemu -net nic -net netmap,ifname=vale-2:c ... &
qemu -net nic -net netmap,ifname=vale-2:d ... &

SEE ALSO

netmap(4)

http://info.iet.unipi.it/~luigi/vale/">http://info.iet.unipi.it/~luigi/vale/

Luigi Rizzo, Giuseppe Lettieri: VALE, a switched ethernet for virtual machines, June 2012, http://info.iet.unipi.it/~luigi/vale/

AUTHORS


.An -nosplit The vale switch was designed and implemented in 2012 by
.An Luigi Rizzo and
.An Giuseppe Lettieri at the Universita‘ di Pisa.

vale was funded by the European Commission within FP7 Projects CHANGE (257422) and OPENLAB (287581).

Search for    or go to Top of page |  Section 4 |  Main Index


Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.