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Mailing List Archive: Linux: Kernel Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks   Index | Next | Previous | View Flat

raghavendra.kt at linux May 7, 2012, 7:47 AM Views: 220 Permalink Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks [In reply to] On 05/07/2012 07:28 PM, Avi Kivity wrote: > On 05/07/2012 04:53 PM, Raghavendra K T wrote: >>> 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. >> > > 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). 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo [at] vger More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/

Subject User Time [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 2, 2012, 3:06 AM     Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks mingo at kernel May 7, 2012, 1:29 AM         Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks avi at redhat May 7, 2012, 1:32 AM             Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 7, 2012, 3:58 AM                 Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks avi at redhat May 7, 2012, 5:06 AM                     Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 7, 2012, 6:20 AM                         Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks avi at redhat May 7, 2012, 6:22 AM                             Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 7, 2012, 6:38 AM                                 Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks vatsa at linux May 7, 2012, 6:46 AM                                     Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks avi at redhat May 7, 2012, 6:49 AM                                         Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 7, 2012, 6:53 AM                                             Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks avi at redhat May 7, 2012, 6:58 AM                                                 Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 7, 2012, 7:47 AM                                                     Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks avi at redhat May 7, 2012, 7:52 AM                                                         Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks avi at redhat May 7, 2012, 7:54 AM                                                         Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks mingo at kernel May 7, 2012, 10:25 AM                                                             Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks tglx at linutronix May 7, 2012, 1:42 PM                                                                 Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks nikunj at linux May 7, 2012, 11:46 PM                                                             Re: [Xen-devel] [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks JBeulich at suse May 15, 2012, 4:26 AM                                                         Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 7, 2012, 10:25 PM                                                         Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 13, 2012, 11:45 AM                                                             Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks nikunj at linux May 13, 2012, 9:57 PM                                                                 Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 14, 2012, 2:01 AM                                                             Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks jeremy at goop May 14, 2012, 12:38 AM                                                                 Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 14, 2012, 1:11 AM                                                             Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 15, 2012, 8:19 PM                                                                 Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 30, 2012, 4:26 AM                                                                     Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux Jun 14, 2012, 5:21 AM                                         Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks vatsa at linux May 7, 2012, 6:55 AM                                         Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks jeremy at goop May 7, 2012, 4:15 PM                                             Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 7, 2012, 6:13 PM                                             Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks avi at redhat May 8, 2012, 2:08 AM                                     Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 7, 2012, 6:56 AM                     Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks raghavendra.kt at linux May 13, 2012, 10:59 AM

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