From: Benjamin Herrenschmidt <benh@au1.ibm.com>
To: svaidy@linux.vnet.ibm.com
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>,
linux-pm@vger.kernel.org,
Daniel Lezcano <daniel.lezcano@linaro.org>,
rjw@rjwysocki.net, linux-kernel@vger.kernel.org, anton@samba.org,
Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] cpuidle: powernv/pseries: Decrease the snooze residency
Date: Sat, 30 May 2015 20:38:22 -0500 [thread overview]
Message-ID: <1433036302.4526.15.camel@au1.ibm.com> (raw)
In-Reply-To: <20150530060141.GA19134@dirshya.in.ibm.com>
On Sat, 2015-05-30 at 11:31 +0530, Vaidyanathan Srinivasan wrote:
> In shared lpar case, spinning in guest context may potentially take
> away cycles from other lpars waiting to run on the same physical cpu.
>
> So the policy in shared lpar case is to let PowerVM hypervisor know
> immediately that the guest cpu is idle which will allow the hypervisor
> to use the cycles for other tasks/lpars.
But that will have negative side effects under KVM no ?
Suresh mentioned something with his new directed interrupts code that we
had many cases where the interrupts ended up arriving shortly after we
exited to host for NAP'ing ...
Snooze might fix it...
Ben.
next prev parent reply other threads:[~2015-05-31 1:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-29 12:32 [PATCH] cpuidle: powernv/pseries: Decrease the snooze residency Shilpasri G Bhat
2015-05-29 13:47 ` Preeti U Murthy
2015-05-30 6:01 ` Vaidyanathan Srinivasan
2015-05-30 8:00 ` Preeti U Murthy
2015-05-31 1:38 ` Benjamin Herrenschmidt [this message]
2015-06-03 15:35 ` Vaidyanathan Srinivasan
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=1433036302.4526.15.camel@au1.ibm.com \
--to=benh@au1.ibm.com \
--cc=anton@samba.org \
--cc=daniel.lezcano@linaro.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=preeti@linux.vnet.ibm.com \
--cc=rjw@rjwysocki.net \
--cc=shilpa.bhat@linux.vnet.ibm.com \
--cc=svaidy@linux.vnet.ibm.com \
/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).