On 04/11/2016 11:11, Ralf Mardorf wrote:
On Fri, 4 Nov 2016 10:35:12 +0000, Yassin Philip wrote:
Is there really no way to just (de)select the options you need,
programmatically?
There isn't, but assuming you already have a config of a generic
or lowlatency kernel with exactly the same version, you want to build
with the rt patch and if you exactly know what are the current rt
related options, you e.g. could use the sed command to edit the config
by a script. There are still pitfall. Regarding some even non-rt related
options, e.g. CONFIG_HZ_1000, it's disputable what to use or not to use.
Depending on the rt patched kernel you want to build, it might make a
difference, if you are using an AMD or Intel CPU, what options to use.
There several times were serious issues with AMD CPUs, that required
dedicated configurations. There is a reason why distros usually don't
provide realtime kernels by official repositories. It's a kernel that
requires fine tuning, it's not a kernel off the rack.
Wow... And I'm not even sure that it's worth :/ I guess I'll stick to my
"sudo apt install linux-lowlatency" nobrainer. One has to admit it's
easier, it even puts itself as default in grub, and stays up-to-date :|
By the way, does the rtirq-init IRQ balancing script work with this kind
of kernel? It seems to launch OK, but given its description "startup
script for realtime-preempt enabled kernels" does it do anything good on
a lowlatency system?
Does anybody here use lowlatency kernels, and do they come with special
usage tips and recommendations? Thanks a lot anyway, Ralf;
Phil
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