Why is intr taking up so much cpu?

Doug Barton dougb at FreeBSD.org
Tue Jul 20 02:33:05 UTC 2010


On Mon, 19 Jul 2010, Chris Ruiz wrote:

> On Mon, Jul 19, 2010 at 8:03 PM, Doug Barton <dougb at freebsd.org> wrote:
>> I added options KDTRACE_HOOKS to my kernel config, built a new kernel, and
>> rebooted. I decided to try your script before things went sideways so I'd
>> have an idea of what to expect, and it didn't work:
>>
>> dtrace: failed to initialize dtrace: DTrace device not available on system
>>
>> Is there something else I need to do to enable it?
>
> You need to build the kernel with CTF.  Try adding "makeoptions
> WITH_CTF=yes" to your config and rebuilding your kernel.  There's a
> blurb in src/UPDATING about other ways to accomplish the same thing.

Thanks for the suggestion, but no improvement. Doing:
strings /boot/kernel/kernel | grep -i dtrace

Shows lots of dtrace-related entries, unlike previous kernels built 
without the KDTRACE_HOOKS option, but same error with Dan's script.


Doug

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