Re: [Xen-ia64-devel] revisit _OSI optimizations?

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On Tue, Nov 20, 2007 at 11:00:52AM -0700, Alex Williamson wrote:
>    What are our alternatives?  I'm afraid any attempt to detect the
> guest OS type will lead to similar problems as _OSI in the future.  As
> this is a performance optimization, I'm leaning towards the need for a
> config option in the domain spec file.  If a user wants to tune for
> performance, they can add a config option, but the default must work
> correctly, if not 100% optimal for all guests.  Are there other ideas or
> objections?  Anyone want to volunteer to take on this task?  Thanks,

Just ideas.

- enhance GFW to set guest os type.
  Then a user set os type in startup.nsh or somehow.

- enhance (guest) elilo. something like 'xen-ostype=linux'.
  Then elilo issues hypercall.

- rely on PV-on-HVM driver
  PV-on-HVM driver issues hypercall.

>From the viewpoint of maintenance, enhancing domain builder seems
the best. 
On the other hand, enhancing domain builder isn't flexible. It ties 
domain configuration to guest os type. But I'm not sure whether users
want such flexibility.
-- 
yamahata

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