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Conference 7.286::fddi

Title:	FDDI - The Next Generation

Moderator:	NETCAD::STEFANI

Created:	Thu Apr 27 1989
Last Modified:	Thu Jun 05 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	2259
Total number of notes:	8590

1729.0. "# of messages ?" by 52445::KATZAV () Thu Jun 29 1995 03:26

    
    My customer needs to know how many messages can he pass between two
    stations connected via FDDI/EISA controller.
    They want to transfer short messages (~100bytes). Did someone measured
    it ?
    
    Thanks,
    Shimon.

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1729.1 STAR::STOCKDALE Thu Jun 29 1995 07:13 10

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1729.1		STAR::STOCKDALE		`Thu Jun 29 1995 07:13`	10
	It depends on a lot of things, application overhead, interface to the device driver, pipeline. For VMS, the driver interfaces are, typically, QIO, DECnet, IP, VCI. Assuming no application overhead and pipeline large enough, QIO should be able to do 6-8k packets/sec for 100 bytes/packet of user data. VCI about 50k packets/sec (DEFEA). The other transports in between. All of these assume one cpu fully consumed on a Sable. Then you'd have to factor in application and other overhead and select the transport. - Dick

It depends on a lot of things, application overhead, interface to the device
driver, pipeline.  For VMS, the driver interfaces are, typically, QIO, DECnet,
IP, VCI.  Assuming no application overhead and pipeline large enough, QIO
should be able to do 6-8k packets/sec for 100 bytes/packet of user data.
VCI about 50k packets/sec (DEFEA).  The other transports in between.

All of these assume one cpu fully consumed on a Sable.  Then you'd have to
factor in application and other overhead and select the transport.

- Dick