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

from [Jan Beulich] [Permanent Link][Original]
To: "Jeremy Fitzhardinge" <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] [PATCH]: Fix Xen domU boot with batched mprotect
From: "Jan Beulich" <jbeulich@xxxxxxxxxx>
Date: Thu, 16 Oct 2008 08:28:33 +0100
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>>> 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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