TMPLee@DOCKMASTER.NCSC.MIL (08/04/89)
NOticed something interesting when running kermit under prodos 8.1 under Sys disk 5.0 (whatever version of GS/OS that is) -- previously when downloading the disk would be accesed about every other packet; it now seemed to be accessed once or twice at the beginning, one in the middle and again at the end. (this was a 33kbyte file). I assume SOMEBODY is buffering up quite a bit -- is that teh new prodos 8 or something in GS/OS itself? TMPLee@dockmaster.ncsc.mil
dlyons@Apple.COM (David Lyons) (08/08/89)
In article <890804163352.555892@DOCKMASTER.ARPA> TMPLee@DOCKMASTER.NCSC.MIL writes: >NOticed something interesting when running kermit under prodos 8.1 under ProDOS 8 1.8 >Sys disk 5.0 (whatever version of GS/OS that is) -- previously when ^-- GS/OS 3.0 >downloading the disk would be accesed about every other packet; it now >seemed to be accessed once or twice at the beginning, one in the middle >and again at the end. (this was a 33kbyte file). I assume SOMEBODY is >buffering up quite a bit -- is that teh new prodos 8 or something in >GS/OS itself? I can't explain the behavior you're getting, but GS/OS is not active while you're running ProDOS 8, so that's out. And ProDOS 8 has not been changed to do large quantities of buffering, either. Did you change Kermit versions or anything? --Dave Lyons, Apple Computer, Inc. | DAL Systems AppleLink--Apple Edition: DAVE.LYONS | P.O. Box 875 AppleLink--Personal Edition: Dave Lyons | Cupertino, CA 95015-0875 GEnie: D.LYONS2 or DAVE.LYONS CompuServe: 72177,3233 Internet/BITNET: dlyons@apple.com UUCP: ...!ames!apple!dlyons My opinions are my own, not Apple's.
TMPLee@DOCKMASTER.NCSC.MIL (08/09/89)
I wonder what I've discovered? To answer the specific questions, I am not using any new version of kermit (its 3.85, unmodified.). The hard drive is an Everex 40D, using Apple SCSI card. I have receive packet length set to 250 bytes. I just downloaded a 32k file and watched the hard drive's light very closely. It flickered at the start, after a couple of packets, then only after 21, 36, and 33 . (my counts could be off one or two since I might have missed one or two while I was writing them down.) So that means some piece of software has something like a 9,000 byte buffer. Who? Oh yes, I also have a Transwarp GS, but I can't think that would be buffering anything going to the SCSI port. I suppose I could revert back to system disk 4.0 and see if memory of how it used to work is playing tricks on me, but I don't really want to do that! (I dont' think I ever bothered to configure a bootable system disk that had the SCSI driver on it.) TMPLee@dockmaster.arpa
TMPLee@DOCKMASTER.NCSC.MIL (08/09/89)
To quote Emily, "Never mind." I dug out some old old old copies of ProDos8 (1.4) and Basic.System (1.1) and put just those and kermit on a disk and tried it. I didn't count all the intervals, but the one I did kermit took in 58 250-byte packets before writing to the hard drive. Sooooooooo, it has nothing to do with Sys Disk 5.0. (I also turned the Transwarp speed to "normal") TMPLee@Dockmaster.NCSC.MIL p.s. -- of course, my original question still stands, but in a different context. Who's doing the buffering?