> On Sun, Feb 16, 2003 at 10:00:14PM +0100, Pavel Cahyna wrote:
> > > > 4. This error comes up in my daily report (or from iostat -x):
> > > > 
> > > > iostat: sysctl hw.diskstats failed: Invalid argument
> > > 
> > > Do you have out of sync kernel and userland ?
> > > 
> > Excuse my ignorance, but isn't sysctl interface here to keep
> > compatibility, even if userland and kernel are out of sync? What's the
> > point of using sysctl if you must keep them in sync? You might as well
> > grovel kernel memory, no?

It should work if you have options COMPAT_16 in your kernel.

Kernel backward compatibility is only kept when you have appropriate
COMPAT_* options in your kernel.

According to commit log in sub_disk.c, there were several bugs
in how programs used hw.diskstats, so when a change the disk statistics
was made, it made vmstat/iostat/systat break. They were fixed
in current so that they won't break in future if similar change
would be done again.

Jaromir
-- 
Jaromir Dolecek <jdolecek@NetBSD.org>            http://www.NetBSD.org/
-=- We should be mindful of the potential goal, but as the tantric    -=-
-=- Buddhist masters say, ``You may notice during meditation that you -=-
-=- sometimes levitate or glow.   Do not let this distract you.''     -=-