From: Avi Kivity <avi@redhat.com>
To: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Greg Kroah-Hartman <gregkh@suse.de>, KVM <kvm@vger.kernel.org>,
linux-doc@vger.kernel.org,
Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
Andi Kleen <andi@firstfloor.org>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@kernel.org>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Xen Devel <xen-devel@lists.xensource.com>, X86 <x86@kernel.org>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Thomas Gleixner <tglx@linutronix.de>,
Virtualization <virtualization@lists.linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
Attilio Rao <attilio.rao@citrix.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Stephan Diestelhorst <stephan.diestelhorst@amd.com>
Subject: Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks
Date: Mon, 07 May 2012 17:52:56 +0300 [thread overview]
Message-ID: <4FA7E1C8.7010509@redhat.com> (raw)
In-Reply-To: <4FA7E06E.20304@linux.vnet.ibm.com>
On 05/07/2012 05:47 PM, Raghavendra K T wrote:
>> Not good. Solving a problem in software that is already solved by
>> hardware? It's okay if there are no costs involved, but here we're
>> introducing a new ABI that we'll have to maintain for a long time.
>>
>
>
> Hmm agree that being a step ahead of mighty hardware (and just an
> improvement of 1-3%) is no good for long term (where PLE is future).
>
PLE is the present, not the future. It was introduced on later Nehalems
and is present on all Westmeres. Two more processor generations have
passed meanwhile. The AMD equivalent was also introduced around that
timeframe.
> Having said that, it is hard for me to resist saying :
> bottleneck is somewhere else on PLE m/c and IMHO answer would be
> combination of paravirt-spinlock + pv-flush-tb.
>
> But I need to come up with good number to argue in favour of the claim.
>
> PS: Nikunj had experimented that pv-flush tlb + paravirt-spinlock is a
> win on PLE where only one of them alone could not prove the benefit.
>
I'd like to see those numbers, then.
Ingo, please hold on the kvm-specific patches, meanwhile.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2012-05-07 14:52 UTC|newest]
Thread overview: 53+ 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 ` [PATCH RFC V8 1/17] x86/spinlock: Replace pv spinlocks with pv ticketlocks 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 ` [PATCH RFC V8 3/17] x86/ticketlock: Collapse a layer of functions 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 ` [PATCH RFC V8 5/17] xen/pvticketlock: Xen implementation for PV ticket locks 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 ` [PATCH RFC V8 7/17] x86/pvticketlock: Use callee-save for lock_spinning 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 10:08 ` [PATCH RFC V8 9/17] Split out rate limiting from jump_label.h 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 ` [PATCH RFC V8 11/17] xen/pvticketlock: Allow interrupts to be enabled while blocking 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 ` [PATCH RFC V8 13/17] kvm hypervisor : Add a hypercall to KVM hypervisor to support pv-ticketlocks 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 ` [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 ` [PATCH RFC V8 16/17] kvm : Paravirtual ticketlocks support for linux guests running on KVM hypervisor 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
2012-05-30 11:54 ` Jan Kiszka
[not found] ` <4FC60A71.5050804@siemens.com>
2012-05-30 13:44 ` Raghavendra K T
2012-05-07 8:29 ` [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks Ingo Molnar
[not found] ` <20120507082928.GI16608@gmail.com>
2012-05-07 8:32 ` Avi Kivity
2012-05-07 10:58 ` Raghavendra K T
2012-05-07 12:06 ` Avi Kivity
2012-05-07 13:20 ` Raghavendra K T
[not found] ` <4FA7CC05.50808@linux.vnet.ibm.com>
2012-05-07 13:22 ` Avi Kivity
2012-05-07 13:38 ` Raghavendra K T
[not found] ` <4FA7D06B.60005@linux.vnet.ibm.com>
2012-05-07 13:46 ` Srivatsa Vaddagiri
[not found] ` <20120507134611.GB5533@linux.vnet.ibm.com>
2012-05-07 13:49 ` Avi Kivity
2012-05-07 13:53 ` Raghavendra K T
2012-05-07 13:55 ` Srivatsa Vaddagiri
[not found] ` <4FA7D3F7.9080005@linux.vnet.ibm.com>
2012-05-07 13:58 ` Avi Kivity
2012-05-07 14:47 ` Raghavendra K T
2012-05-07 14:52 ` Avi Kivity [this message]
2012-05-07 14:54 ` Avi Kivity
2012-05-07 17:25 ` Ingo Molnar
2012-05-08 5:25 ` Raghavendra K T
2012-05-13 18:45 ` Raghavendra K T
2012-05-14 4:57 ` Nikunj A Dadhania
2012-05-14 7:38 ` Jeremy Fitzhardinge
2012-05-14 8:11 ` Raghavendra K T
[not found] ` <87y5ovtl54.fsf@abhimanyu.in.ibm.com>
2012-05-14 9:01 ` Raghavendra K T
2012-05-16 3:19 ` Raghavendra K T
2012-05-30 11:26 ` Raghavendra K T
[not found] ` <4FC603D4.20107@linux.vnet.ibm.com>
2012-06-14 12:21 ` Raghavendra K T
[not found] ` <20120507172527.GA5357@gmail.com>
2012-05-07 20:42 ` Thomas Gleixner
[not found] ` <alpine.LFD.2.02.1205072240020.6271@ionos>
2012-05-08 6:46 ` Nikunj A Dadhania
2012-05-15 11:26 ` [Xen-devel] " Jan Beulich
2012-05-07 23:15 ` Jeremy Fitzhardinge
2012-05-08 1:13 ` Raghavendra K T
2012-05-08 9:08 ` Avi Kivity
2012-05-07 13:56 ` Raghavendra K T
2012-05-13 17:59 ` Raghavendra K T
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