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- Newsgroups: comp.os.coherent
- Path: sparky!uunet!spool.mu.edu!cass.ma02.bull.com!mips2!bubba!sje
- From: sje@xylos.ma30.bull.com (Steven J. Edwards)
- Subject: Slow tar writing to /dev/fva0
- Reply-To: sje@xylos.ma30.bull.com
- Organization: Bull HN, Worldwide Information Systems, Billerica, Mass., USA
- Distribution: comp
- Date: 22 Jan 93 12:06:39
- Message-ID: <SJE.93Jan22120639@xylos.ma30.bull.com>
- Sender: news@mips2.ma30.bull.com (Usenet News Manager)
- Lines: 32
-
- A recent timing of tar writing about 1 Mbyte (200 files) to /dev/fva0
- gave over six minutes of wall time with no other user proceses
- running. The floppy had been formatted using the default skew and
- interleave values of fdformat. Interestingly, the format only takes a
- minute or so.
-
- Also, the man page for fdformat describes the -a option as producing
- output of the form:
-
- hd=d cyl=dd
-
- but the actual program has this reversed:
-
- cyl=dd hd=d
-
- I believe that the second progress message format is correct and more
- common version.
-
- Tar actions seem to stop most system processing. For example, while
- tar is writing, I ran sync from antoher virtual console. The sync
- took several minutes to complete. Also, a ps seems to take quite a
- while if a tar is running.
-
- Is all this the fault of a crummy IDE/floppy controller? Does the fd
- driver need a rewrite? Should I use values other than the defaults
- for skew and interleave with fdformat?
-
- [The above opinions expressed are my own; not necessarily held by others.]
- == Steven J. Edwards Bull HN Information Systems Inc. ==
- == (508) 294-3484 300 Concord Road MS 820A ==
- == sje@xylos.ma30.bull.com Billerica, MA 01821 USA ==
- "That Government which Governs the Least, Governs Best." -- Thomas Jefferson
-