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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!saimiri.primate.wisc.edu!ames!nsisrv!jagubox!jim
- From: jim@jagubox.gsfc.nasa.gov (Jim Jagielski)
- Subject: Re: Yet more about 'tc' (blocking issues)
- Message-ID: <1246@jagubox.gsfc.nasa.gov>
- Lines: 30
- Sender: usenet@nsisrv.gsfc.nasa.gov (Usenet)
- Nntp-Posting-Host: jagubox.gsfc.nasa.gov
- Reply-To: jim@jagubox.gsfc.nasa.gov (Jim Jagielski)
- Organization: NASA/Goddard Space Flight Center
- References: <1228@jagubox.gsfc.nasa.gov> <1992Nov11.032712.26391@noao.edu> <1241@jagubox.gsfc.nasa.gov> <1243@jagubox.gsfc.nasa.gov> <1244@jagubox.gsfc.nasa.gov> <1992Nov14.060233.3593@noao.edu> <1245@jagubox.gsfc.nasa.gov>
- Date: Mon, 16 Nov 1992 13:27:35 GMT
-
- jim@jagubox.gsfc.nasa.gov (Jim Jagielski) writes:
-
- >tody@noao.edu (Doug Tody) writes:
-
- >>I have no information on the SCSI manager and am only grasping for straws,
- >>but a remote possibility exists if the SCSI manager allows transfers which
- >>are a multiple of N times the device block size. In that case, setting the
- >>block size to 1 byte would allow odd size transfers to the device.
-
- >This may be possible... Of course, 'tc' would 1st have to issue a
- >Read Block Limits to see if the device can do down as low as 1byte and
- >then do the Mode Select... This also would mean that things be set up
- >so that the device isn't _really_ in variable mode but in a small fixed
- >blocksize mode...
-
- Well, it looks like the above idea works! (Thanks Doug).
-
- Buttttt... performance under this mode is a super dog. After all, the
- tape drive must handshake for each and every _byte_ transfered.
-
- Anyway, I'll be releasing tc 3.10 (seemed a big enuff improvement to
- warrent a jump from 3.00 to 3.10) Pretty Soon... maybe by COB today.
-
- Oh yeah... I don't even bother with the Read Block Limits, I just have
- 'tc' "force" 1byte block size, if this works, then fine...
- --
- Jim Jagielski | "It is not I who am crazy...
- jim@jagubox.gsfc.nasa.gov | it is I who am MAD!"
- NASA/GSFC, Code 734.4 |
- Greenbelt, MD 20771 | - Ren
-