[Bug 601986] Re: Disk driver problems on Toshiba NB305Netbook

[jim_charlton]

Interesting.  Let's see if I have this straight?  The current kernels
are using dynamic ticks.  nohz=off turns off dynamic ticks so we get
regular ticks as in the old OSs and the scheduler will regularly get
asked to check to see what jobs should be run and prevent one process
from hogging the CPUs.  I guess highres=off must just reduce the rate
that the scheduler is poked to check for jobs waiting.  I am not sure
how this fits with nohpet which also will cure the boot problem but not
the resume from hibernate hang.  I guess nohpet means no high precision
event timer so maybe this supports your ideas of this being a timer
problem.  Indeed, I see another mention of this (see message 5 on
http://www.linuxquestions.org/questions/fedora-installation-39/fc-10-my-
installation-hangs-after-the-first-white-progress-bar-696298/) on a
completely different machine where the user says that tapping the left
SHIFT key will help bypass the problems with the interrupt bug.... and
that adding nohpet to the kernel line will help cure his problem.

I am not sure why changing the BIOS disk parameter from ahci to
compatibility cures the problem as well (although this screws up access
to your windows partition if you still have it).

What we do know is that we don't want to use nohz=off highres=off as it
makes the machine run hot, screws up pulse audio and reduces the time
the machine will run on the battery.  I continue to use bootchart as it
still seems to boot faster than tapping the left SHIFT key.  But both
will work.

We really need to get a developer that understands all of this
interested in this problem.

-- 
Disk driver problems on Toshiba NB305Netbook
https://bugs.launchpad.net/bugs/601986
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