Unix, Xenix and ODT General FAQ
This article is from a FAQ concerning SCO operating
systems. While some of the information may be applicable to any OS,
or any Unix or Linux OS, it may be specific to SCO Xenix, Open
This is an old article about SCO Unix and is only left here for historical purposes.
There is lots of Linux, Mac OS X and general Unix info elsewhere on
this site: Search this site is the best
way to find anything.
NCALL controls the size of the kernel callout table. The kernel
has the ability to schedule some action at a given real time; this
is often used by device drivers and by the nap(S)
system call. The size of this table is set by NCALL. If the system
message "timeout table overflow" appears on your console, NCALL
should be increased.
Increasing NCALL is not expensive in terms of memory or CPU
overhead, as the structure is small (16 bytes per entry) and stored
sorted, so it is best to be generous with these entries.
Linux: you can find a list of kernel parameters in
/usr/src/linux-*/Documentation/kernel-parameters.txt on recent
systems. Sometimes you even get a little bit of explanation. The
versions I have don't list NCALL.
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