[631] in testers
HZ in RT kernel
daemon@ATHENA.MIT.EDU (daemon@ATHENA.MIT.EDU)
Thu May 10 01:45:04 1990
To: testers@ATHENA.MIT.EDU, probe@ATHENA.MIT.EDU
Cc: jik@ATHENA.MIT.EDU
Date: Thu, 10 May 90 01:44:41 EDT
From: John Carr <jfc@ATHENA.MIT.EDU>
The RT kernel has HZ = 100 (previous releases had 64). This is bad: the
workstation is unable to keep accurate time. I went through this when I was
trying out some IBM kernel patches, and the only solution I found was to
reset HZ to 64. Apparently there is some hidden dependency on the old value.
pit-manager and crash are drifting at a rate several percent of real time (I
am running my own kernel, which is not identical to the Athena 7.0 kernel
[hz = 64, for example], and do not have this problem).
I advise RT users not to update until this is resolved.
