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

[jim_charlton]

Inspired by the timer discussion, I revisited hpet.  I tried hpet=force and clocksource=hpet.  Both failed.  So I tried nohpet again.  This gives about a 30 second boot.  Not as fast as when bootchart is installed, but not bad.  If one puts nohpet in /etc/default/grub in line
GRUB_CMDLINE_LINUX="nohpet"
and then run update-grub and reboot, the parameter is persistently used for each boot. 
I then tried hibernate and resume from hibernate.  This also works well, and resume from hibernate takes less than 15 seconds (just like with bootchart installed).

So this is also a way to cure the slow boot problem.  I am not sure what
it does to the highres timers.  I assume that the system is still
running tickless in highres.  Not sure how to check that.  Pulse audio
seems to be working OK which makes me think that the system is running
in highres.

It does not cure the poor disk performance.  hdparm -t /dev/sda5 still
gives me only about 50 MB/sec.  This increases to about 70 MB/sec if one
launches a program that saturates one of the CPUs (like an infinite
loop).  So there is still a problem.

After resume from hibernate, X still crashes randomly which is annoying.
I have been meaning to look into that as well.  X does not crash
randomly after a normal boot.

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