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Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default |
Date: |
Wed, 29 Nov 2017 15:09:18 -0200 |
User-agent: |
Mutt/1.9.1 (2017-09-22) |
On Wed, Nov 29, 2017 at 04:35:25PM +0300, Roman Kagan wrote:
> > On 2017/11/29 18:41, Eduardo Habkost wrote:
[...]
> > > IMO, the long term solution is to make Linux guests not misbehave
> > > when we stop lying about the L3 cache. Maybe we could provide a
> > > "IPIs are expensive, please avoid them" hint in the KVM CPUID
> > > leaf?
>
> We already have it, it's the hypervisor bit ;) Seriously, I'm unaware
> of hypervisors where IPIs aren't expensive.
Sounds good enough to me, if we can convince the Linux kernel
maintainers that it should avoid IPIs under all hypervisors.
--
Eduardo
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, (continued)
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Longpeng (Mike), 2017/11/29
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Roman Kagan, 2017/11/29
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Longpeng (Mike), 2017/11/29
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Eduardo Habkost, 2017/11/29
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Longpeng (Mike), 2017/11/29
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Roman Kagan, 2017/11/29
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default,
Eduardo Habkost <=
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Paolo Bonzini, 2017/11/29
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Roman Kagan, 2017/11/30
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Longpeng (Mike), 2017/11/30
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Roman Kagan, 2017/11/29
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Eduardo Habkost, 2017/11/29
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Michael S. Tsirkin, 2017/11/28
- Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default, Roman Kagan, 2017/11/29