From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: "Raslan, KarimAllah" <karahmed@amazon.de>,
"mtosatti@redhat.com" <mtosatti@redhat.com>,
"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>,
"kernellwp@gmail.com" <kernellwp@gmail.com>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"mingo@kernel.org" <mingo@kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"bsd@redhat.com" <bsd@redhat.com>,
"aarcange@redhat.com" <aarcange@redhat.com>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"ankur.a.arora@oracle.com" <ankur.a.arora@oracle.com>
Subject: Re: [PATCH] sched: introduce configurable delay before entering idle
Date: Mon, 13 May 2019 08:30:36 -0400 [thread overview]
Message-ID: <03ff5f00-d3ab-2c13-77e8-1ceec094f3fd@oracle.com> (raw)
In-Reply-To: <1557748312.17635.17.camel@amazon.de>
On 5/13/19 7:51 AM, Raslan, KarimAllah wrote:
> On Mon, 2019-05-13 at 07:31 -0400, Konrad Rzeszutek Wilk wrote:
>> On May 13, 2019 5:20:37 AM EDT, Wanpeng Li <kernellwp@gmail.com> wrote:
>>> On Wed, 8 May 2019 at 02:57, Marcelo Tosatti <mtosatti@redhat.com>
>>> wrote:
>>>>
>>>>
>>>> Certain workloads perform poorly on KVM compared to baremetal
>>>> due to baremetal's ability to perform mwait on NEED_RESCHED
>>>> bit of task flags (therefore skipping the IPI).
>>> KVM supports expose mwait to the guest, if it can solve this?
>>>
>>
>> There is a bit of problem with that. The host will see 100% CPU utilization even if the guest is idle and taking long naps..
>>
>> Which depending on your dashboard can look like the machine is on fire.
> This can also be fixed. I have a patch that kind of expose proper information
> about the *real* utilization here if that would be help.
Yes, that would certainly be interesting to see. Thanks.
--boris
next prev parent reply other threads:[~2019-05-13 12:31 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-07 18:56 [PATCH] sched: introduce configurable delay before entering idle Marcelo Tosatti
2019-05-07 22:15 ` Peter Zijlstra
2019-05-07 23:44 ` Marcelo Tosatti
2019-05-13 9:20 ` Wanpeng Li
2019-05-13 11:31 ` Konrad Rzeszutek Wilk
2019-05-13 11:51 ` Raslan, KarimAllah
2019-05-13 12:30 ` Boris Ostrovsky [this message]
2019-05-15 1:45 ` Wanpeng Li
2019-05-14 13:50 ` Marcelo Tosatti
2019-05-14 15:20 ` Konrad Rzeszutek Wilk
2019-05-14 17:42 ` Marcelo Tosatti
2019-05-15 1:42 ` Wanpeng Li
2019-05-15 20:26 ` Marcelo Tosatti
2019-05-15 18:42 ` Ankur Arora
2019-05-15 20:43 ` Marcelo Tosatti
2019-05-17 4:32 ` Ankur Arora
2019-05-17 17:49 ` Marcelo Tosatti
2019-05-16 1:07 ` Wanpeng Li
2019-05-17 2:06 ` Ankur Arora
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