From: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
To: Avi Kivity <avi@redhat.com>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
Ingo Molnar <mingo@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Jeremy Fitzhardinge <jeremy@goop.org>,
Greg Kroah-Hartman <gregkh@suse.de>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Marcelo Tosatti <mtosatti@redhat.com>, X86 <x86@kernel.org>,
Gleb Natapov <gleb@redhat.com>, Ingo Molnar <mingo@redhat.com>,
Attilio Rao <attilio.rao@citrix.com>,
Virtualization <virtualization@lists.linux-foundation.org>,
Xen Devel <xen-devel@lists.xensource.com>,
linux-doc@vger.kernel.org, KVM <kvm@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Stephan Diestelhorst <stephan.diestelhorst@amd.com>,
LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Thomas Gl
Subject: Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks
Date: Mon, 07 May 2012 19:23:59 +0530 [thread overview]
Message-ID: <4FA7D3F7.9080005@linux.vnet.ibm.com> (raw)
In-Reply-To: <4FA7D2E5.1020607@redhat.com>
On 05/07/2012 07:19 PM, Avi Kivity wrote:
> On 05/07/2012 04:46 PM, Srivatsa Vaddagiri wrote:
>> * Raghavendra K T<raghavendra.kt@linux.vnet.ibm.com> [2012-05-07 19:08:51]:
>>
>>> I 'll get hold of a PLE mc and come up with the numbers soon. but I
>>> 'll expect the improvement around 1-3% as it was in last version.
>>
>> Deferring preemption (when vcpu is holding lock) may give us better than 1-3%
>> results on PLE hardware. Something worth trying IMHO.
>
> Is the improvement so low, because PLE is interfering with the patch, or
> because PLE already does a good job?
>
It is because PLE already does a good job (of not burning cpu). The
1-3% improvement is because, patchset knows atleast who is next to hold
lock, which is lacking in PLE.
WARNING: multiple messages have this Message-ID (diff)
From: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
To: Avi Kivity <avi@redhat.com>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
Ingo Molnar <mingo@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Jeremy Fitzhardinge <jeremy@goop.org>,
Greg Kroah-Hartman <gregkh@suse.de>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Marcelo Tosatti <mtosatti@redhat.com>, X86 <x86@kernel.org>,
Gleb Natapov <gleb@redhat.com>, Ingo Molnar <mingo@redhat.com>,
Attilio Rao <attilio.rao@citrix.com>,
Virtualization <virtualization@lists.linux-foundation.org>,
Xen Devel <xen-devel@lists.xensource.com>,
linux-doc@vger.kernel.org, KVM <kvm@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Stephan Diestelhorst <stephan.diestelhorst@amd.com>,
LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks
Date: Mon, 07 May 2012 19:23:59 +0530 [thread overview]
Message-ID: <4FA7D3F7.9080005@linux.vnet.ibm.com> (raw)
In-Reply-To: <4FA7D2E5.1020607@redhat.com>
On 05/07/2012 07:19 PM, Avi Kivity wrote:
> On 05/07/2012 04:46 PM, Srivatsa Vaddagiri wrote:
>> * Raghavendra K T<raghavendra.kt@linux.vnet.ibm.com> [2012-05-07 19:08:51]:
>>
>>> I 'll get hold of a PLE mc and come up with the numbers soon. but I
>>> 'll expect the improvement around 1-3% as it was in last version.
>>
>> Deferring preemption (when vcpu is holding lock) may give us better than 1-3%
>> results on PLE hardware. Something worth trying IMHO.
>
> Is the improvement so low, because PLE is interfering with the patch, or
> because PLE already does a good job?
>
It is because PLE already does a good job (of not burning cpu). The
1-3% improvement is because, patchset knows atleast who is next to hold
lock, which is lacking in PLE.
WARNING: multiple messages have this Message-ID (diff)
From: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
To: Avi Kivity <avi@redhat.com>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
Ingo Molnar <mingo@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Jeremy Fitzhardinge <jeremy@goop.org>,
Greg Kroah-Hartman <gregkh@suse.de>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Marcelo Tosatti <mtosatti@redhat.com>, X86 <x86@kernel.org>,
Gleb Natapov <gleb@redhat.com>, Ingo Molnar <mingo@redhat.com>,
Attilio Rao <attilio.rao@citrix.com>,
Virtualization <virtualization@lists.linux-foundation.org>,
Xen Devel <xen-devel@lists.xensource.com>,
linux-doc@vger.kernel.org, KVM <kvm@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Stephan Diestelhorst <stephan.diestelhorst@amd.com>,
LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Thomas
Subject: Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks
Date: Mon, 07 May 2012 19:23:59 +0530 [thread overview]
Message-ID: <4FA7D3F7.9080005@linux.vnet.ibm.com> (raw)
In-Reply-To: <4FA7D2E5.1020607@redhat.com>
On 05/07/2012 07:19 PM, Avi Kivity wrote:
> On 05/07/2012 04:46 PM, Srivatsa Vaddagiri wrote:
>> * Raghavendra K T<raghavendra.kt@linux.vnet.ibm.com> [2012-05-07 19:08:51]:
>>
>>> I 'll get hold of a PLE mc and come up with the numbers soon. but I
>>> 'll expect the improvement around 1-3% as it was in last version.
>>
>> Deferring preemption (when vcpu is holding lock) may give us better than 1-3%
>> results on PLE hardware. Something worth trying IMHO.
>
> Is the improvement so low, because PLE is interfering with the patch, or
> because PLE already does a good job?
>
It is because PLE already does a good job (of not burning cpu). The
1-3% improvement is because, patchset knows atleast who is next to hold
lock, which is lacking in PLE.
next prev parent reply other threads:[~2012-05-07 13:53 UTC|newest]
Thread overview: 139+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-02 10:06 [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks Raghavendra K T
2012-05-02 10:06 ` Raghavendra K T
2012-05-02 10:06 ` [PATCH RFC V8 1/17] x86/spinlock: Replace pv spinlocks with pv ticketlocks Raghavendra K T
2012-05-02 10:06 ` Raghavendra K T
2012-05-02 10:06 ` [PATCH RFC V8 2/17] x86/ticketlock: Don't inline _spin_unlock when using paravirt spinlocks Raghavendra K T
2012-05-02 10:06 ` Raghavendra K T
2012-05-02 10:06 ` [PATCH RFC V8 3/17] x86/ticketlock: Collapse a layer of functions Raghavendra K T
2012-05-02 10:06 ` Raghavendra K T
2012-05-02 10:07 ` [PATCH RFC V8 4/17] xen: Defer spinlock setup until boot CPU setup Raghavendra K T
2012-05-02 10:07 ` Raghavendra K T
2012-05-02 10:07 ` [PATCH RFC V8 5/17] xen/pvticketlock: Xen implementation for PV ticket locks Raghavendra K T
2012-05-02 10:07 ` Raghavendra K T
2012-05-02 10:07 ` [PATCH RFC V8 6/17] xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks Raghavendra K T
2012-05-02 10:07 ` Raghavendra K T
2012-05-02 10:07 ` [PATCH RFC V8 7/17] x86/pvticketlock: Use callee-save for lock_spinning Raghavendra K T
2012-05-02 10:07 ` Raghavendra K T
2012-05-02 10:07 ` [PATCH RFC V8 8/17] x86/pvticketlock: When paravirtualizing ticket locks, increment by 2 Raghavendra K T
2012-05-02 10:07 ` Raghavendra K T
2012-05-02 10:08 ` [PATCH RFC V8 9/17] Split out rate limiting from jump_label.h Raghavendra K T
2012-05-02 10:08 ` Raghavendra K T
2012-05-02 10:08 ` [PATCH RFC V8 10/17] x86/ticketlock: Add slowpath logic Raghavendra K T
2012-05-02 10:08 ` Raghavendra K T
2012-05-02 10:08 ` [PATCH RFC V8 11/17] xen/pvticketlock: Allow interrupts to be enabled while blocking Raghavendra K T
2012-05-02 10:08 ` Raghavendra K T
2012-05-02 10:08 ` [PATCH RFC V8 12/17] xen: Enable PV ticketlocks on HVM Xen Raghavendra K T
2012-05-02 10:08 ` Raghavendra K T
2012-05-02 10:08 ` [PATCH RFC V8 13/17] kvm hypervisor : Add a hypercall to KVM hypervisor to support pv-ticketlocks Raghavendra K T
2012-05-02 10:08 ` Raghavendra K T
2012-05-02 10:09 ` [PATCH RFC V8 14/17] kvm : Fold pv_unhalt flag into GET_MP_STATE ioctl to aid migration Raghavendra K T
2012-05-02 10:09 ` Raghavendra K T
2012-05-02 10:09 ` [PATCH RFC V8 15/17] kvm guest : Add configuration support to enable debug information for KVM Guests Raghavendra K T
2012-05-02 10:09 ` Raghavendra K T
2012-05-02 10:09 ` [PATCH RFC V8 16/17] kvm : Paravirtual ticketlocks support for linux guests running on KVM hypervisor Raghavendra K T
2012-05-02 10:09 ` Raghavendra K T
2012-05-02 10:09 ` [PATCH RFC V8 17/17] Documentation/kvm : Add documentation on Hypercalls and features used for PV spinlock Raghavendra K T
2012-05-02 10:09 ` Raghavendra K T
2012-05-30 11:54 ` Jan Kiszka
2012-05-30 11:54 ` Jan Kiszka
2012-05-30 13:44 ` Raghavendra K T
2012-05-30 13:44 ` Raghavendra K T
2012-05-07 8:29 ` [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks Ingo Molnar
2012-05-07 8:29 ` Ingo Molnar
2012-05-07 8:32 ` Avi Kivity
2012-05-07 8:32 ` Avi Kivity
2012-05-07 10:58 ` Raghavendra K T
2012-05-07 10:58 ` Raghavendra K T
2012-05-07 12:06 ` Avi Kivity
2012-05-07 12:06 ` Avi Kivity
2012-05-07 13:20 ` Raghavendra K T
2012-05-07 13:20 ` Raghavendra K T
2012-05-07 13:20 ` Raghavendra K T
2012-05-07 13:20 ` Raghavendra K T
2012-05-07 13:22 ` Avi Kivity
2012-05-07 13:22 ` Avi Kivity
2012-05-07 13:38 ` Raghavendra K T
2012-05-07 13:38 ` Raghavendra K T
2012-05-07 13:38 ` Raghavendra K T
2012-05-07 13:46 ` Srivatsa Vaddagiri
2012-05-07 13:46 ` Srivatsa Vaddagiri
2012-05-07 13:46 ` Srivatsa Vaddagiri
2012-05-07 13:49 ` Avi Kivity
2012-05-07 13:49 ` Avi Kivity
2012-05-07 13:53 ` Raghavendra K T [this message]
2012-05-07 13:53 ` Raghavendra K T
2012-05-07 13:53 ` Raghavendra K T
2012-05-07 13:58 ` Avi Kivity
2012-05-07 13:58 ` Avi Kivity
2012-05-07 14:47 ` Raghavendra K T
2012-05-07 14:47 ` Raghavendra K T
2012-05-07 14:52 ` Avi Kivity
2012-05-07 14:52 ` Avi Kivity
2012-05-07 14:54 ` Avi Kivity
2012-05-07 14:54 ` Avi Kivity
2012-05-07 17:25 ` Ingo Molnar
2012-05-07 17:25 ` Ingo Molnar
2012-05-07 17:25 ` Ingo Molnar
2012-05-07 17:25 ` Ingo Molnar
2012-05-07 20:42 ` Thomas Gleixner
2012-05-07 20:42 ` Thomas Gleixner
2012-05-07 20:42 ` Thomas Gleixner
2012-05-08 6:46 ` Nikunj A Dadhania
2012-05-08 6:46 ` Nikunj A Dadhania
2012-05-08 6:46 ` Nikunj A Dadhania
2012-05-08 6:46 ` Nikunj A Dadhania
2012-05-07 20:42 ` Thomas Gleixner
2012-05-15 11:26 ` [Xen-devel] " Jan Beulich
2012-05-15 11:26 ` Jan Beulich
2012-05-15 11:26 ` Jan Beulich
2012-05-08 5:25 ` Raghavendra K T
2012-05-08 5:25 ` Raghavendra K T
2012-05-08 5:25 ` Raghavendra K T
2012-05-08 5:25 ` Raghavendra K T
2012-05-13 18:45 ` Raghavendra K T
2012-05-13 18:45 ` Raghavendra K T
2012-05-13 18:45 ` Raghavendra K T
2012-05-14 4:57 ` Nikunj A Dadhania
2012-05-14 4:57 ` Nikunj A Dadhania
2012-05-14 4:57 ` Nikunj A Dadhania
2012-05-14 4:57 ` Nikunj A Dadhania
2012-05-14 9:01 ` Raghavendra K T
2012-05-14 9:01 ` Raghavendra K T
2012-05-14 9:01 ` Raghavendra K T
2012-05-14 9:01 ` Raghavendra K T
2012-05-14 7:38 ` Jeremy Fitzhardinge
2012-05-14 7:38 ` Jeremy Fitzhardinge
2012-05-14 8:11 ` Raghavendra K T
2012-05-14 8:11 ` Raghavendra K T
2012-05-16 3:19 ` Raghavendra K T
2012-05-16 3:19 ` Raghavendra K T
2012-05-16 3:19 ` Raghavendra K T
2012-05-30 11:26 ` Raghavendra K T
2012-05-30 11:26 ` Raghavendra K T
2012-05-30 11:26 ` Raghavendra K T
2012-05-30 11:26 ` Raghavendra K T
2012-06-14 12:21 ` Raghavendra K T
2012-06-14 12:21 ` Raghavendra K T
2012-06-14 12:21 ` Raghavendra K T
2012-06-14 12:21 ` Raghavendra K T
2012-05-07 13:53 ` Raghavendra K T
2012-05-07 13:55 ` Srivatsa Vaddagiri
2012-05-07 13:55 ` Srivatsa Vaddagiri
2012-05-07 13:55 ` Srivatsa Vaddagiri
2012-05-07 23:15 ` Jeremy Fitzhardinge
2012-05-07 23:15 ` Jeremy Fitzhardinge
2012-05-08 1:13 ` Raghavendra K T
2012-05-08 1:13 ` Raghavendra K T
2012-05-08 9:08 ` Avi Kivity
2012-05-08 9:08 ` Avi Kivity
2012-05-07 13:56 ` Raghavendra K T
2012-05-07 13:56 ` Raghavendra K T
2012-05-07 13:56 ` Raghavendra K T
2012-05-07 13:56 ` Raghavendra K T
2012-05-07 13:46 ` Srivatsa Vaddagiri
2012-05-07 13:38 ` Raghavendra K T
2012-05-13 17:59 ` Raghavendra K T
2012-05-13 17:59 ` Raghavendra K T
2012-05-13 17:59 ` Raghavendra K T
2012-05-13 17:59 ` Raghavendra K T
2012-05-07 8:29 ` Ingo Molnar
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=4FA7D3F7.9080005@linux.vnet.ibm.com \
--to=raghavendra.kt@linux.vnet.ibm.com \
--cc=a.p.zijlstra@chello.nl \
--cc=akpm@linux-foundation.org \
--cc=andi@firstfloor.org \
--cc=attilio.rao@citrix.com \
--cc=avi@redhat.com \
--cc=gleb@redhat.com \
--cc=gregkh@suse.de \
--cc=hpa@zytor.com \
--cc=jeremy@goop.org \
--cc=konrad.wilk@oracle.com \
--cc=kvm@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=mingo@redhat.com \
--cc=mtosatti@redhat.com \
--cc=stefano.stabellini@eu.citrix.com \
--cc=stephan.diestelhorst@amd.com \
--cc=torvalds@linux-foundation.org \
--cc=vatsa@linux.vnet.ibm.com \
--cc=virtualization@lists.linux-foundation.org \
--cc=x86@kernel.org \
--cc=xen-devel@lists.xensource.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.