Re: [Xen-devel] [RFC PATCHv2 0/3]: x86/ept: reduce translation invalidation impact

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 02/12/15 07:14, Tian, Kevin wrote:
>> From: David Vrabel [mailto:david.vrabel@xxxxxxxxxx]
>> Sent: Saturday, November 14, 2015 2:50 AM
>>
>> This RFC series improves the performance of EPT by reducing the impact
>> of the translation invalidations (ept_sync_domain()).  Two approaches
>> are used:
>>
>> a) Removing unnecessary invalidations after fixing misconfigured
>>    entries (after a type change).
>>
>> b) Deferring invalidations until the p2m write lock is released.
> 
> Do you have a sense which one above incurs more overhead?

No, but fixing (a) probably gives us the biggest win since it removes
the sync entirely.

David


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