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Apurdue.120 net.2bsd-bugs utzoo!decvax!pur-ee!purdue!cak Sun Aug 30 22:37:49 1981 Slow DZ We made our first foray into high speed uucp (1200 baud vadic modem) without crashing under 2.8bsd today. We have a DZ, and an 11/60 and previously we had crashed every time we tried to use the vadic. Today, we started iostat 1 on a terminal, and uucico on another, and nothing else, and discovered that the system was about 1% idle on the average. We had to move uuxqt to uuxqt. to prevent it from starting, because it would crash. ANYTHING would crash the system (except maybe another iostat; logging in and starting a csh would take it down). Our DZ did not seem to be such a load under v6; any ideas why? This is really an unacceptable situation, help would be appreciated. Has anyone tried to put the 'pseudo-DMA' DZ driver for the VAX onto an 11? This might be the solution. I also have code for a somewhat more unorthodox DZ driver from UNSW -- they throw away DZ interrupts completely and poll the device under control of a KW-11P. We don't have a P, just a K, and no software for it, and I am not really looking forward to converting both to version 7. I tried to debug a crash dump yesterday, and found that some of the saved PC values pointed into the 040000 page, where there are no global symbols. A full nm showed that there are symbols beginning with ~ (excuse my ignorance, but what are those, in relation to similarly named symbols beginning with _) but the symbols I found were ridiculous; for example, the trace back showed something like:

_panic() _trap() _call() ~lpclose() ~rlread() _trap() _call()

Which makes little, if any sense (I understand the calls and traps, but...) The crashes are at the same location, always! (620 -- in the middle of _dump????).

Also, we tried increasing NMOUNT from 6 to 8. As soon as we mount the 7th file system (including the root) the system just goes away somewhere, in a large loop. Haven't figured that one out yet, either.

HELP! Chris Kent (cincy!chris) P.S. Even though I am writing from Purdue, all the above refers to U of Cincinnati (cincy on the net). Reply either to cincy!chris or purdue!cak.

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