Re: [Xen-devel] NUMA TODO-list for xen-devel

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.08.12 at 00:34, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> wrote:
>>  From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> The question is whether trading functionality for performance
>> is an acceptable choice.
> 
> If there were a lwn.net equivalent for Xen, I'd be pushing to get
> quoted on the following:
> 
> "Virtualization: You can have flexibility or you can have performance.
> Pick one."
> 
> A couple of years ago when NUMA was first being extensively discussed
> for Xen, I suggested that this should really be a "top level" flag
> that a sysadmin should be able to select: Either optimize for
> performance or optimize for flexibility.  Then Xen and the Xen tools
> should "do the right thing" depending on the selection.
> 
> I still think this is a good way to surface the tradeoffs for
> a very complex problem to the vast majority of users/admins.
> Clearly they will want "both" but forcing the choice will
> provoke more thought about their use model, as well as provide
> important guidance to the underlying implementations.

I would expect a good part to pick performance, and then
go whine about something not working in an emergency. On
xen-devel one could respond with this-is-what-you-get, but
you can't necessarily do so to paying customers...

Jan


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