Bug#763695: console-setup: even worse than assumed
Eduard Bloch, le Tue 25 Aug 2015 21:35:36 +0200, a écrit :
> * Samuel Thibault [Tue, Aug 25 2015, 08:54:35PM]:
> > Just so that people reading the log don't take it too exagerated:
>
> > Eduard Bloch, le Tue 25 Aug 2015 20:24:22 +0200, a écrit :
> > > I checked again... about 20% of the time is spent in two calls of pidof
> >
> > We're here talking about ~15ms each.
>
> I don't. It's ~270ms each (I added another log with timestamps).
How long is the readlink /proc/*/exe | grep?
> It might be true for a shiny Core-i7 system.
Actually I also tried with an old Xeon with a few hundred processes
running
> > > And about 70% is spent by loadkeys executing the mentioned storm of ioctls.
> >
> > And about 70ms.
>
> Or ~1.8s on the mentioned device.
Ouch. The optimization I mentioned could perhaps reduce that, in a not
too complex setup (shift, alt, control, altgr, capslock modifiers) by a
4x factor. To go further a kernel patch is really needed, there is no
way around it.
Samuel
Reply to: