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Re: [Xen-devel] [PATCH v9] new config option vtsc_tolerance_khz to avoid TSC emulation

To: xen-devel@xxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
From: Olaf Hering <olaf@xxxxxxxxx>
Date: Tue, 26 Jun 2018 19:11:13 +0200
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
Delivery-date: Tue, 26 Jun 2018 17:13:18 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Am Thu,  7 Jun 2018 15:08:29 +0200
schrieb Olaf Hering <olaf@xxxxxxxxx>:

> Add an option to control when vTSC emulation will be activated for a
> domU with tsc_mode=default. Without such option each TSC access from
> domU will be emulated, which causes a significant perfomance drop for
> workloads that make use of rdtsc.

Andrew,

do you have any comments on this patch/approach?

Olaf

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References:
- [Xen-devel] [PATCH v9] new config option vtsc_tolerance_khz to avoid TSC emulation
  - From: Olaf Hering

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