Keep the FC6 kernel at 2.6.20 or move it to 2.6.21?

[Jay Cliburn]

On Sun, 29 Apr 2007 14:57:49 -0400
Dave Jones <davej at redhat.com> wrote:

> We could do a rebase to .21 this week, and push that out to testing,
> and if anything critical turns up before that becomes deemed stable,
> we could push a branched build off of .20 directly to updates.
> 
> Most of the scary stuff (new libata pata drivers etc), we'd keep off,
> so things shouldn't be too bad.  The timer changes for tickless are
> probably the only remaining scary thing. For that we have a few
> choices.
> - Leave NO_HZ off.
>   Feature parity with FC6, though the code has still changed, and
>   may still find regressions. Probably the safest option.
> - Turn NO_HZ on.
>   Early preview of F7 features, saves power yadayada, may find new
>   bugs. (Gets us that nice fuzzy 'f6 bugs are f7 bugs' bonus though)
> - Turn NO_HZ on, but do the same as we did for MSI (enable the config,
>   but only if you boot with a command line option).
>   Might find us even more regressions, that aren't even relevant
> upstream.

What about MSI?  On or off?