Re: [Xen-devel] [PATCH]: Fix Xen domU boot with batched mprotect

From: Jan Beulich
Date: Thu Oct 16 2008 - 03:27:58 EST

>>> Jeremy Fitzhardinge <jeremy@xxxxxxxx> 15.10.08 18:23 >>>
>> But
>> performance-wise, CONFIG_HIGHPTE sucks under Xen anyway, so you'd
>> better not turn this on in the first place. We may want/need to provide
>> a means to disable this at run time so the same kernel when run natively
>> could still make use of it, but without impacting performance under Xen.
>That's a secondary issue. What's the source of the performance hit?
>Just all the extra kmap_atomic operations?

Yes, afaict.

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