Determine switch buffer size


 
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Old 02-04-2011
Determine switch buffer size

Hi everybody,

I need to calculate the tcp buffer size of a network switch, since it's not specified in the manual; how do I do this?

I have some machines connected to the switch and I can run some socket tests written in C between these machines (I can choose how many bytes to send and calculate the senders' and receiver's bandwidth) and I guess I need to keep sending more and more data until I see some slowdown in the sender's bandwidth (because that means that the senders are sending more data than the switch can handle), but I'm not sure about this.

Thanks for your help!
 
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VDE_PLUG2TAP(1) 					      General Commands Manual						   VDE_PLUG2TAP(1)

NAME
vde_plug2tap - Virtual Distributed Ethernet plug-to-tap SYNOPSIS
vde_plug2tap [OPTION]... tap_name DESCRIPTION
vde_plug2tap is a plug to be connected into a VDE switch. All the data that is catched by the plug is sent to the tap interface tap_name and everything from that interface is injected in the switch. Example: vde_plug2tap tap4 connects the default switch (/var/run/vde.ctl) to the tap4 interface. OPTIONS
-p, --port=portnum It is possible to decide which port of the switch to use. When this option is not specified the switch assigns the first available unused port (if any). It is possible to connect several cables in the same switch port: in this way all this cables work concur- rently. It means that packet can result as duplicate but no ARP table loops are generated. Is useful when vde is used for mobil- ity. Several physical interfaces can be used at a time during handoffs to prevent hichups in connectivity. -g, --group=group group ownership of the communication socket. For security when more want to share a switch it is better to use a unix group to own the comm sockets so that the network traffic cannot be sniffed. -m, --mod=octal-mode octal chmod like permissions for the comm sockets -s, --sock=socket specify the UNIX socket to be used by local programs for joining the VDE. The default value is "/var/run/vde.ctl". When '-' is used in place of the VDE switch directory, vde_plug2tap works as a plug (see vde_plug(1)). The command: dpipe vde_plug = ssh remote.machine.org vde_plug2tap -s - tapx connects the default local switch to a remote tapx interface. -d, --daemon start vde_plug2tap as a background process -P, --pidfile=pidfile put the process ID of vde_plug2tap in pidfile. Can be used with --daemon to store the PID for future killing. -h, --help show a brief help NOTICE
Virtual Distributed Ethernet is not related in any way with www.vde.com ("Verband der Elektrotechnik, Elektronik und Informationstechnik" i.e. the German "Association for Electrical, Electronic & Information Technologies"). SEE ALSO
vde_switch(1), vde_plug(1), vdeq(1), dpipe(1). AUTHOR
VDE is a project by Renzo Davoli <renzo@cs.unibo.it> Virtual Distributed Ethernet December 5, 2006 VDE_PLUG2TAP(1)