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Chapter 3 System Preparation160 September 2002 HPSS Installation GuideRelease 4.5, Revision 2gather performance data using a variety of settings to determine the optimal combinations.The primary values that govern performance include send/receive buffers, size of reads/writes, and rfc1323 value for high performance networks (HIPPI, G-Enet). Create a tableshowing these values. An example table can be found below:To test the receiving machines performance issue:% ttcp -r -s -b -lTo test the sending machines performance issue:% ttcp -t -s -b -l The following is an example of the information to be gathered from the above commands(assumes en0 is 10 MB Ethernet, if en0 is Fast or G-Enet, rfc1323 should be on:Receiver TableInterface Bsize Lsize RFC1323 Performance CPU utilizationen0 16k 16k Off -- --en0 16k 8k Off -- --en0 64k 64k Off -- --en0 64k 32k Off -- --...ccs0 64k 64k On -- --ccs0 64k 32k On -- --...Sender TableInterface Bsize Lsize RFC1323 Performance CPU utilizationen0 16k 16k Off -- --en0 16k 8k Off -- --en0 64k 64k Off -- --en0 64k 32k Off -- --...ccs0 64k 64k On -- --ccs0 64k 32k On -- --...What you are looking for are the best values possible for each network connection. Thesevalues will be used in turn by HPSS to optimize its data transfers. By no means is this acomplete picture of what controls network performance. In fact, the assumption is madethat the customer already has the networks optimized by their local network group or hascontacted outside assistance to perform this task. The process described here is todetermine the best user-level values to optimize HPSS performance on an already tunednetwork, rather then trying to fix underlying network problems.To test the TCP socket performance over a network connection, issue the following on thereceiving node:% ttcp -r -s -pwhere a typical port is 4321. Then issue the following on the transmitting node:% ttcp -t -s -p |
