Non-SMP on SMP hardware
Hendrik Strydom
hns1 at iinet.net.au
Tue Aug 29 00:52:13 UTC 2006
On Mon, 2006-08-28 at 17:39 -0600, Ashley M. Kirchner wrote:
> I just finished installing FC5 on a machine and now I can't boot it
> up. The motherboard supports two CPUs, however only one's installed.
> But for some stupid reason, the installer decided to put only the smp
> kernel on, instead of both the smp as well as the single (one-up)
> kernel, so I can't boot the machine now. It locks up during the boot
> process, doing what appears to be something with CPU1 which doesn't
> exist. It goes through CPU0 just fine then quits. Does anyone have any
> suggestions on how to rectify this problem now? The machine does not
> have a CD drive in it so I can't boot the rescue (or any other) disk.
You may have success by adding
isolcpus=1
to the kernel command line, which should limit your system to using
CPU#0.
Alternatively you could boot from floppy, chroot to the installed root
and manually add a non-smp kernel from the NFS mounted source with rpm
-i.
> With past FC versions it always installed two kernels, one smp and
> one non-smp so I always had the choice to boot with the single one (then
> proceed to remove the smp one since I don't need it.) Apparently FC5
> disagrees with that arrangement.
It was recently reported on the list that FC6 will only ship with SMP
kernels, since it works fine on (most) uni-processor units.
Regards
Hendrik
> For those curious, I booted it through floppies [1] and did an NFS
> install.
>
> [1] http://www.thisiscool.com/fcfloppy.htm
>
> --
> W | It's not a bug - it's an undocumented feature.
> +--------------------------------------------------------------------
> Ashley M. Kirchner <mailto:ashley at pcraft.com> . 303.442.6410 x130
> IT Director / SysAdmin / Websmith . 800.441.3873 x130
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>
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