RFC: Adding a hw.features sysctl
doconnor at gsoft.com.au
Sun Jan 13 18:37:17 PST 2008
On Mon, 14 Jan 2008, Igor Mozolevsky wrote:
> On 13/01/2008, Peter Jeremy <peterjeremy at optushome.com.au> wrote:
> > IMHO, no. Virtually all similar FreeBSD information is exported
> > via sysctl and this sort of information fits neatly into the
> > existing MIB tree as either dev.cpu.N.features or hw.cpu.features
A single handy counter example to the many many that are sysctls :)
> If it's in /dev you can do neat tricks like ioctl-ing queries (like
> ioctl(/dev/cpuinfo, CINFOCTL_HAS_FEATURES, CINFO_SSE3|CINFO_SSSE3))
> instead of having *every* app parse the result of a sysctl; most of
> the time you'd only want to check for specific feature , it's much
> easier to do an ioctl that returns a boolean.
Except you can't do that from a shell script.
(eg wrapper script to run optimised binaries)
sysctl is easy and sysctl is common, just use it..
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
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