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- Newsgroups: comp.protocols.nfs,comp.protocols.tcp-ip.ibmpc,comp.dcom.lans.ethernet
- Path: sparky!uunet!spool.mu.edu!sdd.hp.com!cs.utexas.edu!torn!maccs!beame
- From: beame@maccs.dcss.mcmaster.ca (Carl Beame)
- Subject: Re: Sun <=> PC Transfer Rate (Summary)
- Message-ID: <1992Sep12.224253.14328@maccs.dcss.mcmaster.ca>
- Organization: McMaster University, Hamilton, Ontario, Canada.
- References: <karl.23.716089551@empirical.com> <BuDFv1.3n6@watserv1.uwaterloo.ca> <920911085058@minimillian.ftp.com>
- Date: Sat, 12 Sep 1992 22:42:53 GMT
- Lines: 33
-
- In article <920911085058@minimillian.ftp.com> backman@vaxeline.ftp.com (Larry Backman) writes:
- >
- [stuff deleted]
- >
- > The 3C509 (if this is what you are referring to) has serious problems with
- > 8K receives. I have had little luck in getting its OS/2 NDIS driver to
- > consistently receive all 6 IP fragments in an 8K RPC. 3Com's response
- > has been to state that the NFS protocol is flawed if it expects to
- > receive 6 back to back packets.
- >
- > The board has only a 2K buffer.
- >
- > Draw your own conclusions.
- >
- >Larry Backman
- >FTP Software
-
- We have also done tests with the 3C509 card. The tiny buffer size makes
- the card little better then their 3C501. Its not just NFS that can expect a
- large number of back to back packets, TCP does as well. In our TCP/IP we
- set the incoming TCP Window based on the buffer size in the card. A WD8003E/A
- micro channel card can run with a 6 to 8K TCP Window size, because it can
- accept 6 to 8 back to back packets in its 16K buffer. Many high speed protocols
- (Novell's new high speed blit protocol) are based on the fact that the receiver
- can handle many back to back packets with out waiting for an ACK.
-
- In my experience with our TCP over many ethernet cards, the main
- factors in performance were the size of the cards buffer and the speed of the
- system bus. Ofcourse the CPU is important, but with INTEL machines, the CPU
- can usually process packets faster than the cards can deliver them to the CPU.
-
- Carl Beame
- Beame & Whiteside Software Ltd.
-