On 27.05.2014 08:10, Brett Lymn wrote:
On Tue, May 27, 2014 at 08:04:54AM +0200, bodie wrote:
Setting swappiness to 0 helps more, but then why is that parameter
here
at all?
Why Linux is swapping most used pages even as there's plenty of free
RAM and cache is
total mystery.
because it is doing exactly what you asked it to do. This isn't a
linux
list so I won't bother explaining why but it just goes to show if you
play with things you don't understand you can end up shooting
yourself
in the foot and then amplify the effect by telling everyone.
I did not ask Linux to swap something if there's plenty of RAM and
cache.
Especially not stuff which is actively used. That's called failed
design.
Was not happening couple of years back and is not happening inside my
OpenBSD
systems.
I know that there's number of other knobs to "tune it", but I don't
want
to waste my time with them. And I know what's vm.swappiness doing just
that's
it's not worth of it especially in distro like Ubuntu which is supposed
to
work for most of the typical home users. System on HW where all devices
are
working in that system and which swap and lags even during simplest
usage
can't be considered proper design at all no matter if fiddling with
knobs
can improve/fix situation. It's more fine example of bad design
decisions
like oom-killer, systemd and such.
--
Brett Lymn
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