From: David Vrabel <david.vrabel@citrix.com>
To: "Tian, Kevin" <kevin.tian@intel.com>,
David Vrabel <david.vrabel@citrix.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: George Dunlap <george.dunlap@eu.citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Tim Deegan <tim@xen.org>,
"Nakajima, Jun" <jun.nakajima@intel.com>,
Jan Beulich <jbeulich@suse.com>
Subject: Re: [RFC PATCHv2 0/3]: x86/ept: reduce translation invalidation impact
Date: Thu, 3 Dec 2015 15:59:05 +0000 [thread overview]
Message-ID: <566066C9.8040208@citrix.com> (raw)
In-Reply-To: <AADFC41AFE54684AB9EE6CBC0274A5D15F7298BA@SHSMSX101.ccr.corp.intel.com>
On 02/12/15 07:14, Tian, Kevin wrote:
>> From: David Vrabel [mailto:david.vrabel@citrix.com]
>> 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
prev parent reply other threads:[~2015-12-03 15:59 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-13 18:49 [RFC PATCHv2 0/3]: x86/ept: reduce translation invalidation impact David Vrabel
2015-11-13 18:49 ` [PATCHv2 1/3] x86/ept: remove unnecessary sync after resolving misconfigured entries David Vrabel
2015-12-02 7:17 ` Tian, Kevin
2015-11-13 18:49 ` [PATCHv2 2/3] mm: don't free pages until mm locks are released David Vrabel
2015-11-16 11:52 ` Jan Beulich
2015-11-16 12:02 ` David Vrabel
2015-11-16 12:04 ` Jan Beulich
2015-11-30 14:10 ` David Vrabel
2015-12-02 7:25 ` Tian, Kevin
2015-12-02 16:23 ` Tim Deegan
2015-12-02 16:30 ` George Dunlap
2015-12-02 16:46 ` Jan Beulich
2015-12-02 16:46 ` Tim Deegan
2015-12-02 17:01 ` George Dunlap
2015-12-02 17:14 ` David Vrabel
2015-12-03 10:22 ` Jan Beulich
2015-12-03 10:56 ` George Dunlap
2015-12-02 16:45 ` David Vrabel
2015-12-02 17:17 ` George Dunlap
2015-11-13 18:49 ` [PATCHv2 3/3] x86/ept: defer the invalidation until the p2m lock is released David Vrabel
2015-12-02 7:14 ` [RFC PATCHv2 0/3]: x86/ept: reduce translation invalidation impact Tian, Kevin
2015-12-03 15:59 ` David Vrabel [this message]
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