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- Newsgroups: comp.sys.hp
- Path: sparky!uunet!stanford.edu!leland.Stanford.EDU!umunhum!jdj
- From: jdj@umunhum.stanford.edu (John D Johnson)
- Subject: Slow pipe from HPUX to ULTRIX
- Message-ID: <1992Sep12.005654.2249@leland.Stanford.EDU>
- Sender: news@leland.Stanford.EDU (Mr News)
- Organization: Stanford University
- Date: Sat, 12 Sep 92 00:56:54 GMT
- Lines: 29
-
-
- I have found that when I pipe data from my 9000/370 HPUX to DEC ULTRIX
- using remsh the data rate is very low, about one tenth the rate of
- piping data to HPUX or SunOS machines. For example, cat'ing a 1.1M
- file to a remote /dev/null:
- Time,
- seconds
-
- To 8.0 HPUX, 9000/S370: cat /hp-ux | remsh cake "cat > /dev/null" 8.3
- To 8.07 HPUX, 9000/S730: cat /hp-ux | remsh danish "cat > /dev/null" 7.8
- To 4.2 ULTRIX, DEC3100: cat /hp-ux | remsh umunhum "cat > /dev/null" 75.6
-
- Piping from HPUX to Ultrix achieves only about 15 Kbytes per second!
-
- While piping to Ultrix, the load on both machines stays below 10%.
- Monitor reports an input and output packet rate of 6-12 packets per
- second, and the only errors are several "Unknown protocol" packets.
- When piping to HPUX, monitor reports about 150 output packets per
- second and 50 input packets per second.
-
- Additional data: ftp can copy the file to Ultrix's /dev/null in 4.85
- seconds (231.30 Kbytes/s). Rdump from HPUX to ULTRIX achieves about
- 60 Kbytes per second. Sending data the other direction, rsh pipes from
- Ultrix to HPUX achieve about 130 Kbytes/sec.
-
- Anybody have any idea what is going on and what I can do to fix it?
-
- John D. Johnson jdj@umunhum.Stanford.EDU
- Computer Systems Laboratory, Stanford University
-