Slow rsh performance linux->solaris

[Morgan Fletcher <morgan@hahaha.org>]

I posted previously about slow rdump times from linux to solaris. I
later tried dumping a local partition to another partition on the same
linux box, and it was blazing fast with no errors. So then I just
tried sending packets from linux to (a pipe to rsh to) solaris and
timing it. In this environment, linux is butt-slow when compared to
other unices. All machines are on the same 10base-t network. Check it
out:

  linux->solaris
  time dd if=/dev/zero count=16384 ibs=1k | rsh ale dd of=/dev/null obs=1k
  16384+0 records in
  32768+0 records out
  24459+10016 records in
  16384+0 records out

  real    1m27.993s
  user    0m0.290s
  sys     0m0.790s

  solaris->solaris (two different boxes):
  time dd if=/dev/zero count=16384 ibs=1k | rsh ale dd of=/dev/null obs=1k
  16384+0 records in
  32768+0 records out
  32768+0 records in
  16384+0 records out

  real    0m17.389s
  user    0m1.814s
  sys     0m6.696s

  aix->solaris
  # time dd if=/dev/zero count=16384 bs=1k | ( rsh ale 'dd of=/dev/null bs=1k' )  
  16384+0 records in.
  16384+0 records out.
  11491+11492 records in
  11491+11492 records out

  real    0m15.27s
  user    0m0.12s
  sys     0m1.27s

Any ideas as to why rsh/rdump are so slow? If I rcp files from this
linux box to that solaris box it's quite fast, same with ftp. 

morgan
P.S. Would have tried the same thing with hpux, but no /dev/zero.
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>> M o r g a n   F l e t c h e r         http://www.hahaha.org <<
>> Tibi gratias agimus quod nihil fumas.     morgan@hahaha.org <<