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

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avi at redhat

May 7, 2012, 5:06 AM


Views: 1022
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Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks [In reply to]

On 05/07/2012 01:58 PM, Raghavendra K T wrote:
> On 05/07/2012 02:02 PM, Avi Kivity wrote:
>> On 05/07/2012 11:29 AM, Ingo Molnar wrote:
>>> This is looking pretty good and complete now - any objections
>>> from anyone to trying this out in a separate x86 topic tree?
>>
>> No objections, instead an
>>
>> Acked-by: Avi Kivity<avi [at] redhat>
>>
>
> Thank you.
>
> Here is a benchmark result with the patches.
>
> 3 guests with 8VCPU, 8GB RAM, 1 used for kernbench
> (kernbench -f -H -M -o 20) other for cpuhog (shell script while
> true with an instruction)
>
> unpinned scenario
> 1x: no hogs
> 2x: 8hogs in one guest
> 3x: 8hogs each in two guest
>
> BASE: 3.4-rc4 vanilla with CONFIG_PARAVIRT_SPINLOCK=n
> BASE+patch: 3.4-rc4 + debugfs + pv patches with
> CONFIG_PARAVIRT_SPINLOCK=y
>
> Machine : IBM xSeries with Intel(R) Xeon(R) x5570 2.93GHz CPU (Non
> PLE) with 8 core , 64GB RAM
>
> (Less is better. Below is time elapsed in sec for x86_64_defconfig
> (3+3 runs)).
>
> BASE BASE+patch %improvement
> mean (sd) mean (sd)
> case 1x: 66.0566 (74.0304) 61.3233 (68.8299) 7.16552
> case 2x: 1253.2 (1795.74) 131.606 (137.358) 89.4984
> case 3x: 3431.04 (5297.26) 134.964 (149.861) 96.0664
>

You're calculating the improvement incorrectly. In the last case, it's
not 96%, rather it's 2400% (25x). Similarly the second case is about
900% faster.

--
error compiling committee.c: too many arguments to function

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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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