Having heard about how Windows thought a P4 EE CPU was running at 10MHz, I decided to do a bit of poking around the FreeBSD kernel to check that all the frequencies were correctly expressed in 64-bit values. While I quickly saw that they were all u_int64_t, I was a bit worried when I saw a sizeof(u_int) in one place, even though it did seem to have a qualifier saying it was a 64-bit integer. Shouldn't machdep.tsc_freq be read-only, by changing line 147 of sys/i386/i386/tsc.c to read CTLFLAG_RD instead of CTLFLAG_RW? I've attached a log of what happened on my system when I changed the sysctl value. I haven't done a lot of investigation into the kernel here so I'm willing to accept that I may be completely wrong, but something just doesn't seem quite right.
-- Bruce Cran
box1# sysctl machdep.tsc_freq machdep.tsc_freq: 1401716358 box1# sysctl machdep.tsc_freq=4294967294 machdep.tsc_freq: 1401716358 -> 4294967294 box1# sysctl machdep.tsc_freq=4294967299 machdep.tsc_freq: 4294967294 -> 3 box1# sysctl machdep.tsc_freq=42949672500 machdep.tsc_freq: 3 -> 204
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