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Message-ID: <87ehw0bw9v.fsf@abhimanyu.in.ibm.com> Date: Mon, 19 Dec 2011 17:36:52 +0530 From: Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com> To: Avi Kivity <avi@...hat.com> Cc: Ingo Molnar <mingo@...e.hu>, peterz@...radead.org, linux-kernel@...r.kernel.org, vatsa@...ux.vnet.ibm.com, bharata@...ux.vnet.ibm.com Subject: Re: [RFC PATCH 0/4] Gang scheduling in CFS On Mon, 19 Dec 2011 13:59:37 +0200, Avi Kivity <avi@...hat.com> wrote: > On 12/19/2011 01:50 PM, Nikunj A Dadhania wrote: > > On Mon, 19 Dec 2011 13:44:02 +0200, Avi Kivity <avi@...hat.com> wrote: > > > On 12/19/2011 01:23 PM, Ingo Molnar wrote: > > > > What's behind this huge speedup? Does ebizzy use user-space > > > > spinlocks perhaps? Could we do something on the user-space side > > > > to get a similar speedup? > > > > > > kvm tries to detect spinlocks (by trapping repeated executions of PAUSE) > > > and yield to a related vcpu. It's far from perfect however, and relies > > > on the spinlock code using PAUSE. > > > > > Avi, is this soft-PLE kind of thing? > > No, hard PLE, see the calls to yield_to. > The above ebizzy result is from a non-PLE machine, will yield_to come in to picture here? I have two set of results, one for PLE machine and other for non-PLE. Nikunj -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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