[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Xen-devel] [PATCH RFC V4 0/5] kvm : Paravirt-spinlock support for KVM guests
- To: Alexander Graf <agraf@xxxxxxx>
- From: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>
- Date: Mon, 16 Jan 2012 19:13:07 +0530
- Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxx>, Gleb Natapov <gleb@xxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Jan Kiszka <jan.kiszka@xxxxxxxxxxx>, Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Randy Dunlap <rdunlap@xxxxxxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Xen <xen-devel@xxxxxxxxxxxxxxxxxxx>, Dave Jiang <dave.jiang@xxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, Glauber Costa <glommer@xxxxxxxxxx>, X86 <x86@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>, Sasha Levin <levinsasha928@xxxxxxxxx>, Sedat Dilek <sedat.dilek@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>, Suzuki Poulose <suzuki@xxxxxxxxxxxxxxxxxx>, Rob Landley <rlandley@xxxxxxxxxxxxx>
- Delivery-date: Wed, 18 Jan 2012 10:35:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
On 01/16/2012 09:27 AM, Alexander Graf wrote:
[...]
Result for PLE machine:
======================
Machine : IBM xSeries with Intel(R) Xeon(R) X7560 2.27GHz CPU with 32/64 core,
with 8
online cores and 4*64GB RAM
Kernbench:
BASE BASE+patch %improvement
mean (sd) mean (sd)
Scenario A:
case 1x: 161.263 (56.518) 159.635 (40.5621) 1.00953
case 2x: 190.748 (61.2745) 190.606 (54.4766) 0.0744438
case 3x: 227.378 (100.215) 225.442 (92.0809) 0.851446
Scenario B:
446.104 (58.54 ) 433.12733 (54.476) 2.91
Dbench:
Throughput is in MB/sec
NRCLIENTS BASE BASE+patch %improvement
mean (sd) mean (sd)
8 1.101190 (0.875082) 1.700395 (0.846809) 54.4143
16 1.524312 (0.120354) 1.477553 (0.058166) -3.06755
32 2.143028 (0.157103) 2.090307 (0.136778) -2.46012
So on a very contended system we're actually slower? Is this expected?
I think, the result is interesting because its PLE machine. I have to
experiment more with parameters, SPIN_THRESHOLD, and also may be ple_gap
and ple_window.
Alex
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
