Xref: utzoo comp.sys.amiga.hardware:5527 comp.sys.amiga.datacomm:14 Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!apple!usc!wuarchive!psuvax1!psuvm!cunyvm!ndsuvm1!mtus5!ldshaner From: LDSHANER@MTUS5.BITNET (Leon D. Shaner) Newsgroups: comp.sys.amiga.hardware,comp.sys.amiga.datacomm Subject: Z-Modem x-fers with XPRZmodem (CPU HOG - Help Needed) Message-ID: <91008.162720LDSHANER@MTUS5.BITNET> Date: 8 Jan 91 21:27:20 GMT Organization: Computing Technology Services, Michigan Technological Univ. Lines: 31 Can anyone shed some light where improving performance/efficiency is concerned during file transfers on an unaccelerated B2000 running 1.3 WB and 1.2 KS ???? I have a CheckPoint 'The Serial Solution' two-port serial card in addition to the built-in port, but the problem occurs on any of the three ports... When data is being received in a Z-Modem transfer, using the XPRZmodem.library, there is almost no CPU left for other tasks, and the transfer is only 2400bps! What I need help in determining is whether the inefficiency is likely to be in the hardware, the software drivers for the hardware, in the XPRZmodem.library, or in the program making the calls to the XPRZmodem.library (a stand-alone cli process which handles opening the port and initiating the transfer, etc.) Another point which I must mention is that it is when receiving data, rather than when sending, that the machine gets all bogged down. It was my guess that The Serial Solution card was requiring that the CPU manage each byte that came over the line and that was requiring more attention... Timing would be far more critical when receiving data, than when sending, so I expect that to be part of the inefficiency... This made some sense until I realized that the built-in serial port behaves pretty much the same, speedwise. Any guesses, hints, or divine revelations appreciated... --Leon +--------------------------------+-----------------------------------+ | LEON D. SHANER :BBS: AMIGA BITSWAP CENTRAL DISPATCH: | OR : (906)482-8248 DIALOG PRO! BETA : | MICHIGAN TECHNOLOGICAL UNIVERSITY : FREE! :24 HOURS :80 MB :2 LINES!: +------------------------------------+-----------------------------------+