In FreeBSD-11:
- for boot messages, configure SC_KERNEL_CONS_ATTR to anything except its
default of FG_WHITE (0xf).
- after booting, use the hw.syscons.kattr sysctl to change the array of
MAXCPU kernel attributes to whatever you want (all FG_WHITE to get the
old behaviour). sysctl(8) doesn't handle arrays very well, so it takes
rarely-used options to even print the values in the array.
I tried doing this real quick, but it did not change a thing:
#include <sys/types.h>
#include <sys/sysctl.h>
#include <string.h>
#include <stdio.h>
int main(int argc, char** argv)
{
char kattr[256];
memset(kattr, 0x0f, 256);
if (sysctlbyname("hw.syscons.kattr", NULL, 0, kattr, 256) == -1)
{
perror("sysctl");
return 1;
}
return 0;
}
It doesn't error out, but it does not change a thing, I still kept
getting colored messages. Maybe I misunderstood your instructions? This
is on 11.2-RELEASE by the way.
But don't turn it off. Try using better colors (don't use dark gray).
Even I like colorized kernel messages, and I stopped using colorized ls
25 years ago.
It's not so bad with only dark gray (though it looks a bit broken), but
once you add more CPUs, it starts looking like an xmas tree. I too, like
my consoles to be gray and boring and disable colored ls.
And also, unless one actively works on the kernel, I fail to see the
need to know from which CPU did a specific kernel message originate.
- Koro
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