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

avi at redhat May 8, 2012, 2:08 AM Views: 198 Permalink Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks [In reply to] On 05/08/2012 02:15 AM, Jeremy Fitzhardinge wrote: > On 05/07/2012 06:49 AM, Avi Kivity wrote: > > On 05/07/2012 04:46 PM, Srivatsa Vaddagiri wrote: > >> * Raghavendra K T <raghavendra.kt [at] linux> [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? > > How does PLE help with ticket scheduling on unlock? I thought it would > just help with the actual spin loops. PLE yields to up a random vcpu, hoping it is the lock holder. This patchset wakes up the right vcpu. For small vcpu counts the difference is a few bad wakeups (and even a bad wakeup sometimes works, since it can put the spinner to sleep for a bit). I expect that large vcpu counts would show a greater difference. -- error compiling committee.c: too many arguments to function -- 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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