From: Avi Kivity <avi@redhat.com>
To: habanero@linux.vnet.ibm.com
Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Marcelo Tosatti <mtosatti@redhat.com>,
Ingo Molnar <mingo@redhat.com>, Rik van Riel <riel@redhat.com>,
S390 <linux-s390@vger.kernel.org>,
Carsten Otte <cotte@de.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
KVM <kvm@vger.kernel.org>, chegu vinod <chegu_vinod@hp.com>,
LKML <linux-kernel@vger.kernel.org>, X86 <x86@kernel.org>,
Gleb Natapov <gleb@redhat.com>,
linux390@de.ibm.com,
Srivatsa Vaddagiri <srivatsa.vaddagiri@gmail.com>,
Joerg Roedel <joerg.roedel@amd.com>
Subject: Re: [PATCH RFC 0/2] kvm: Improving directed yield in PLE handler
Date: Wed, 11 Jul 2012 12:00:01 +0300 [thread overview]
Message-ID: <4FFD4091.8040804@redhat.com> (raw)
In-Reply-To: <1341870457.2909.27.camel@oc2024037011.ibm.com>
On 07/10/2012 12:47 AM, Andrew Theurer wrote:
>
> For the cpu threads in the host that are actually active (in this case
> 1/2 of them), ~50% of their time is in kernel and ~43% in guest. This
> is for a no-IO workload, so that's just incredible to see so much cpu
> wasted. I feel that 2 important areas to tackle are a more scalable
> yield_to() and reducing the number of pause exits itself (hopefully by
> just tuning ple_window for the latter).
One thing we can do is autotune ple_window. If a ple exit fails to wake
anybody (because all vcpus are either running, sleeping, or in ple
exits) then we deduce we are not overcommitted and we can increase the
ple window. There's the question of how to decrease it again though.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2012-07-11 9:00 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-09 6:20 [PATCH RFC 0/2] kvm: Improving directed yield in PLE handler Raghavendra K T
2012-07-09 6:20 ` [PATCH RFC 1/2] kvm vcpu: Note down pause loop exit Raghavendra K T
2012-07-09 6:33 ` Raghavendra K T
2012-07-09 22:39 ` Rik van Riel
2012-07-10 11:22 ` Raghavendra K T
2012-07-11 8:53 ` Avi Kivity
2012-07-11 10:52 ` Raghavendra K T
2012-07-11 11:18 ` Avi Kivity
2012-07-11 11:56 ` Raghavendra K T
2012-07-11 12:41 ` Andrew Jones
2012-07-12 10:58 ` Nikunj A Dadhania
2012-07-12 11:02 ` Raghavendra K T
2012-07-09 6:20 ` [PATCH RFC 2/2] kvm PLE handler: Choose better candidate for directed yield Raghavendra K T
2012-07-09 22:30 ` Rik van Riel
2012-07-10 11:46 ` Raghavendra K T
2012-07-09 7:55 ` [PATCH RFC 0/2] kvm: Improving directed yield in PLE handler Christian Borntraeger
2012-07-10 8:27 ` Raghavendra K T
2012-07-11 9:06 ` Avi Kivity
2012-07-11 10:17 ` Christian Borntraeger
2012-07-11 11:04 ` Avi Kivity
2012-07-11 11:16 ` Alexander Graf
2012-07-11 11:23 ` Avi Kivity
2012-07-11 11:52 ` Alexander Graf
2012-07-11 12:48 ` Avi Kivity
2012-07-12 2:19 ` Benjamin Herrenschmidt
2012-07-11 11:18 ` Christian Borntraeger
2012-07-11 11:39 ` Avi Kivity
2012-07-12 5:11 ` Raghavendra K T
2012-07-12 8:11 ` Avi Kivity
2012-07-12 8:32 ` Raghavendra K T
2012-07-12 2:17 ` Benjamin Herrenschmidt
2012-07-12 8:12 ` Avi Kivity
2012-07-12 11:24 ` Benjamin Herrenschmidt
2012-07-12 10:38 ` Nikunj A Dadhania
2012-07-11 11:51 ` Raghavendra K T
2012-07-11 11:55 ` Christian Borntraeger
2012-07-11 12:04 ` Raghavendra K T
2012-07-11 13:04 ` Raghavendra K T
2012-07-09 21:47 ` Andrew Theurer
2012-07-10 9:26 ` Raghavendra K T
2012-07-10 10:07 ` [PATCH RFC 0/2] kvm: Improving directed yield in PLE handler : detailed result Raghavendra K T
2012-07-10 11:54 ` [PATCH RFC 0/2] kvm: Improving directed yield in PLE handler Raghavendra K T
2012-07-10 13:27 ` Andrew Theurer
2012-07-11 9:00 ` Avi Kivity [this message]
2012-07-11 13:59 ` Raghavendra K T
2012-07-11 14:01 ` Raghavendra K T
2012-07-12 8:15 ` Avi Kivity
2012-07-12 8:25 ` Raghavendra K T
2012-07-12 12:31 ` Avi Kivity
2012-07-09 22:28 ` Rik van Riel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4FFD4091.8040804@redhat.com \
--to=avi@redhat.com \
--cc=borntraeger@de.ibm.com \
--cc=chegu_vinod@hp.com \
--cc=cotte@de.ibm.com \
--cc=gleb@redhat.com \
--cc=habanero@linux.vnet.ibm.com \
--cc=hpa@zytor.com \
--cc=joerg.roedel@amd.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=linux390@de.ibm.com \
--cc=mingo@redhat.com \
--cc=mtosatti@redhat.com \
--cc=raghavendra.kt@linux.vnet.ibm.com \
--cc=riel@redhat.com \
--cc=srivatsa.vaddagiri@gmail.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).