Date: Mon, 14 Jan 2008 02:38:29 +0000 From: "Igor Mozolevsky" <igor@hybrid-lab.co.uk> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: Kostik Belousov <kostikbel@gmail.com>, Peter Jeremy <peterjeremy@optushome.com.au>, freebsd-current@freebsd.org, Joe Marcus Clarke <marcus@freebsd.org>, current <current@freebsd.org> Subject: Re: RFC: Adding a hw.features[2] sysctl Message-ID: <a2b6592c0801131838jcde3634le6087d2f784adcbc@mail.gmail.com> In-Reply-To: <200801141254.20400.doconnor@gsoft.com.au> References: <1200197787.67286.13.camel@shumai.marcuscom.com> <20080113182457.GN929@server.vk2pj.dyndns.org> <a2b6592c0801131721w25afae5bg3dcf6a90c1a3d2b7@mail.gmail.com> <200801141254.20400.doconnor@gsoft.com.au>
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On 14/01/2008, Daniel O'Connor <doconnor@gsoft.com.au> wrote: > On Mon, 14 Jan 2008, Igor Mozolevsky wrote: > > On 13/01/2008, Peter Jeremy <peterjeremy@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 > > > > /dev/sndstat? > > 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) cat /dev/cpuinfo and parse away! Igor
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