Feisty linux-image-386 does not support SMP.

[Dylan]

Binary package hint: linux-image-386

Straight from /boot/config-2.6.20-14-386:

#
# Processor type and features
#
# CONFIG_SMP is not set
CONFIG_X86_PC=y
# CONFIG_X86_ELAN is not set

So you can imagine my surprise when I upgraded from Edgy to Feisty, and suddenly had a uniprocessor system instead of the SMP one I'd had for Badger, Dapper, and Edgy....

[Kyle McMartin (kyle)]

So install -generic.

[Ben Collins (ben-collins)]

If you had linux-image-386 in breezy, dapper and edgy, then it also did not have SMP enabled. At no point in Ubuntu's history has the -386 image been SMP enabled. It used to be -686-smp and -k7-smp, but now it's just the -generic that is SMP enabled.

sudo apt-get install linux-image-generic, or linux-generic if you want linux-restricted-modules too.

[Dylan (dylang)]

You're missing the point; the upgrade process selected this kernel, not me. Way back in the day, I had a k7-smp kernel. Then at some point it became the generic image (through Dapper removing the old legacy packages, via Synaptic as I was updating the kernel modules). I have my CPU usage on my KDE panel, so I know when the SMP -> UMP transition occurred, and that was during the upgrade process of 'gksu "update-manager -c -d"'

...

So, why would the update manager select a UMP kernel? This is the issue I was hoping you guys would help me with.

And, yes, I installed generic. Sheesh.

[Michael Vogt (mvo)]

I think what we can and should do is to ask on a release upgrade to install a -generic kernel if we find more than a single cpu in /proc/cpuinfo. Too late for feisty unfortunately

[Michael Vogt (mvo)]

This is implemented in hardy now.