* Mark Lord <[email protected]> wrote:
> >also, we context-switch kernel threads in 350 nsecs on current
> >hardware and the -rt kernel is certainly happy with that and runs all
> >hardirqs
>
> Ingo, how relevant is that "350 nsecs on current hardware" claim?
>
> I don't mean that in a bad way, but my own experience suggests that
> most people doing real hard RT (or tight soft RT) are not doing it on
> x86 architectures. But rather on lowly 1GHz (or less) ARM based
> processors and the like.
it's not relevant to those embedded boards, but it's relevant to the AIO
discussion, which centers around performance.
> For RT issues, those are the platforms I care more about, as those are
> the ones that get embedded into real-time devices.
yeah. Nevertheless if you want to use -rt on your desktop (under Fedora
4/5/6) you can track an rpmized+distroized full kernel package quite
easily, via 3 easy commands:
cd /etc/yum.repos.d
wget http://people.redhat.com/~mingo/realtime-preempt/rt.repo
yum install kernel-rt.x86_64 # on x86_64
yum install kernel-rt # on i686
which is closely tracking latest upstream -git. (for example, the
current kernel-rt-2.6.20-rc7.1.rt3.0109.i686.rpm is based on
2.6.20-rc7-git1, so if you want to run a kernel rpm that has all of
Linus' latest commits from yesterday, this might be for you.)
it's rumored to be a quite smooth kernel ;-) So in this sense, because
this also runs on all my testboxes by default, it matters on modern
hardware too, at least to me. Today's commodity hardware is tomorrow's
embedded hardware. If a kernel is good on today's colorful desktop
hardware then it will be perfect for tomorrow's embedded hardware.
Ingo
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