linux-kernel - Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks

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Message-ID: <878vh3rwyx.fsf@linux.vnet.ibm.com>
Date:	Tue, 08 May 2012 12:16:46 +0530
From:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>
Cc:	Avi Kivity <avi@...hat.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Marcelo Tosatti <mtosatti@...hat.com>, X86 <x86@...nel.org>,
	Gleb Natapov <gleb@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	Attilio Rao <attilio.rao@...rix.com>,
	Virtualization <virtualization@...ts.linux-foundation.org>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	linux-doc@...r.kernel.org, KVM <kvm@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Stephan Diestelhorst <stephan.diestelhorst@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks

On Mon, 7 May 2012 22:42:30 +0200 (CEST), Thomas Gleixner <tglx@...utronix.de> wrote:
> On Mon, 7 May 2012, Ingo Molnar wrote:
> > * Avi Kivity <avi@...hat.com> wrote:
> > 
> > > > 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.
> > > 
Do not have PLE numbers yet for pvflush and pvspinlock. 

I have seen on Non-PLE having pvflush and pvspinlock patches -
kernbench, ebizzy, specjbb, hackbench and dbench all of them improved. 

I am chasing a race currently on pv-flush path, it is causing
file-system corruption. I will post these number along with my v2 post.

> > > I'd like to see those numbers, then.
> > > 
> > > Ingo, please hold on the kvm-specific patches, meanwhile.
> > 
> > I'll hold off on the whole thing - frankly, we don't want this 
> > kind of Xen-only complexity. If KVM can make use of PLE then Xen 
> > ought to be able to do it as well.
> > 
> > If both Xen and KVM makes good use of it then that's a different 
> > matter.
> 
> Aside of that, it's kinda strange that a dude named "Nikunj" is
> referenced in the argument chain, but I can't find him on the CC list.
> 
/me waves my hand

Regards
Nikunj

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