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Re: [PATCH 0/2] x86/spec-ctrl: Reduce HVM RSB overhead
- To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- Date: Thu, 11 Aug 2022 10:55:01 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHYrBGYD8msKpsBAEGG8Ts5UdCmda2piXiA
- Thread-topic: [PATCH 0/2] x86/spec-ctrl: Reduce HVM RSB overhead
On 09/08/2022 18:00, Andrew Cooper wrote:
> Xen happens to be not vulnerable to PBRSB, but it turns out we can improve the
> performance on all eIBRS systems.
>
> Andrew Cooper (2):
> x86/spec-ctrl: Enumeration for PBRSB_NO
> x86/spec-ctrl: Reduce HVM RSB overhead where possible
Network perf testing on IceLake Server says this turns into a 2% guest
bandwidth improvement.
~Andrew
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