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Full Discussion: collision backoff algorithm
Special Forums UNIX and Linux Applications Infrastructure Monitoring collision backoff algorithm Post 302312967 by otheus on Monday 4th of May 2009 09:30:51 AM
Old 05-04-2009
Quote:
i looking for a formula for collison backoff algorithm to find the average time to successfully transmit a complete frame. i have the the sslot time and successive collision.
Well, first, the backoff algorithms are usually at the MAC (Medium Access Control) layer, so it depends what medium (thin Ethernet, UTP Ethernet, Fast, GigE, 10Gig, Wireless, etc) you're talking about. When I was taught this subject years ago, the backoff algorithm used by Ethernet was exponential, starting maybe at 2 clock ticks or something. (Then 4, then 8, then 16). But maybe there was a random fuzz factor involved. (If there is, then computing the average would be to compute the mean of the random range, and add that to whatever).
 

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LEARN ABOUT DEBIAN

sge

SGE(4)							   BSD Kernel Interfaces Manual 						    SGE(4)

NAME

     sge -- Silicon Integrated Systems SiS190/191 Fast/Gigabit Ethernet driver

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel configuration file:

	   device miibus
	   device sge

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   if_sge="YES"

DESCRIPTION

     The sge device driver provides support for SiS190 Fast Ethernet controllers and SiS191 Fast/Gigabit Ethernet controllers.

     All LOMs supported by the sge driver have TCP/UDP/IP checksum offload for transmit and receive, TCP segmentation offload (TSO), hardware VLAN
     tag stripping/insertion features.	Due to lack of documentation Wake On Lan (WOL), Jumbo frame and an interrupt moderation mechanism are not
     supported yet.

     The sge driver supports the following media types:

     autoselect   Enable autoselection of the media type and options.  The user can manually override the autoselected mode by adding media
		  options to rc.conf(5).

     10baseT/UTP  Set 10Mbps operation.

     100baseTX	  Set 100Mbps (Fast Ethernet) operation.

     1000baseTX   Set 1000baseTX operation over twisted pair.

     The sge driver supports the following media options:

     full-duplex  Force full duplex operation.

     half-duplex  Force half duplex operation.

     For more information on configuring this device, see ifconfig(8).

HARDWARE

     The sge device driver provides support for the following Ethernet controllers:

     o	 SiS190 Fast Ethernet controller
     o	 SiS191 Fast/Gigabit Ethernet controller

SEE ALSO

     altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), rgephy(4), vlan(4), ifconfig(8)

HISTORY

     The sge driver was written by Alexander Pohoyda <alexander.pohoyda@gmx.net>.  And enhanced by Nikolay Denev <ndenev@gmail.com>.  It first
     appeared in FreeBSD 8.1.

BSD
								 January 16, 2011							       BSD
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