Re: How to boot with the "irqpoll" option?
On Tuesday, March 10, 2015 at 2:40:05 PM UTC+5:30, Darac Marjal wrote:
> On Mon, Mar 09, 2015 at 07:49:04PM -0700, Rusi Mody wrote:
> > On Tuesday, March 10, 2015 at 7:30:07 AM UTC+5:30, Kynn Jones wrote:
> > > On Mon, Mar 9, 2015 at 8:30 PM, Kynn Jones wrote:
> > > > On Mon, Mar 9, 2015 at 10:41 AM, Kynn Jones wrote:
> > > >> A log message in my /var/log/syslog file says:
> > > >>
> > > >> ... kernel: [ 61.599288] irq 16: nobody cared (try booting with the
> > > >> "irqpoll" option)
> > > >>
> > > >> I imagine that booting with the "irqpoll" option is achieved by adding
> > > >> a suitable entry to /boot/grub/grub.cfg, but this file clearly states
> > > >> that it should not be edited directly, since it is generated
> > > >> programmatically.
> > > >>
> > > >> I need more information to proceed, but I was not able to find any
> > > >> documentation on how to boot "with the 'irqpoll' option", either
> > > >> online, or by running
> > > >>
> > > >> # find / -name man -type d -exec grep -irl irqpoll {} \;
> > > >>
> > > >> on my machine as root.
> > > >>
> > > >> I would be thankful for pointers to the relevant docs, or for a recipe
> > > >> aimed to a grub-noob.
> > > >
> > > >
> > > > OK, I found a solution. I'll post it here, so that the next schlub
> > > > doesn't have to waste so much time as I did looking for it:
> > > >
> > > > % sudo gedit /etc/default/grub
> > >
> > > ...
> > >
> > > Here's a different, more direct, approach:
> > >
> > > Reboot. When the GRUB menu comes up, select a suitable (Linux)
> > > option, but instead of pressing [RETURN], press 'e'. This will bring
> > > you to an editable screen. Navigate to the line that begins with
> > >
> > > /boot/vmlinuz-...
> > >
> > > Add ' irqpoll' at the end of this line, and then hit `Ctrl-x` to boot
> > > the system.
> > >
> > > This method has the disadvantage that the same procedure must be
> > > followed every time one wants to boot with "irqpoll" enabled. On the
> > > other hand, enabling "irqpoll" is considered only a temporary measure,
> > > so it's probably a good thing to keep its activation inconvenient.
> > >
> > > kj
> >
> > 3rd option.
> > Do the addition to the linux (ie kernel) line of /boot/grub/grub.cfg
> >
> > Yeah the file says dont do that.
> > The grub guys make that suggestion but dont really follow it themselves!
> > This will work until the next time some upgrade changes the cfg file
>
> Which is exactly WHY you're encouraged not to edit that file. People
> tend not to like having their configurations disappear without warning,
> so there's a big warning at the top of the file.
True
But Kynn did say:
| This method has the disadvantage that the same procedure must be
| followed every time one wants to boot with "irqpoll" enabled. On the
| other hand, enabling "irqpoll" is considered only a temporary measure,
| so it's probably a good thing to keep its activation inconvenient.
So I guessed he wanted some intermediate level of 'temporiness'
And as for the warning in grub.cfg: I believe the minor reason is that one can
lose settings in an upgrade.
The major one is by messing the file one can get an unbootable system
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