From: Eduardo Habkost <ehabkost@redhat.com>
To: Roman Kagan <rkagan@virtuozzo.com>,
"Longpeng (Mike)" <longpeng2@huawei.com>,
"Denis V. Lunev" <den@virtuozzo.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Denis Plotnikov <dplotnikov@virtuozzo.com>,
pbonzini@redhat.com, rth@twiddle.net, qemu-devel@nongnu.org,
Gonglei <arei.gonglei@huawei.com>,
zhaoshenglong <zhaoshenglong@huawei.com>
Subject: Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default
Date: Wed, 29 Nov 2017 15:09:18 -0200 [thread overview]
Message-ID: <20171129170918.GA3037@localhost.localdomain> (raw)
In-Reply-To: <20171129133524.GA2279@rkaganb.sw.ru>
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
next prev parent reply other threads:[~2017-11-29 17:09 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-24 13:26 [Qemu-devel] [PATCH] i386: turn off l3-cache property by default Denis Plotnikov
2017-11-28 18:54 ` Michael S. Tsirkin
2017-11-28 19:50 ` Paolo Bonzini
2017-11-28 20:05 ` Eduardo Habkost
2017-11-29 4:56 ` Roman Kagan
2017-11-28 19:58 ` Eduardo Habkost
2017-11-28 20:20 ` Denis V. Lunev
2017-11-28 21:13 ` Eduardo Habkost
2017-11-29 1:57 ` Gonglei (Arei)
2017-11-29 5:55 ` rkagan
2017-11-29 6:01 ` Gonglei (Arei)
2017-11-29 5:20 ` Longpeng (Mike)
2017-11-29 6:01 ` Roman Kagan
2017-11-29 7:38 ` Longpeng (Mike)
2017-11-29 10:41 ` Eduardo Habkost
2017-11-29 11:58 ` Longpeng (Mike)
2017-11-29 13:35 ` Roman Kagan
2017-11-29 17:09 ` Eduardo Habkost [this message]
2017-11-29 17:15 ` Paolo Bonzini
2017-11-30 6:28 ` Roman Kagan
2017-11-30 9:26 ` Longpeng (Mike)
2017-11-29 5:46 ` Roman Kagan
2017-11-29 10:25 ` Eduardo Habkost
2017-11-29 4:17 ` Michael S. Tsirkin
2017-11-29 6:25 ` Roman Kagan
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