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[Xen-ia64-devel] HVM Multi-Processor Performance followup

To: xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-ia64-devel] HVM Multi-Processor Performance followup
From: Kayvan Sylvan <kayvan@xxxxxxxxx>
Date: Thu, 31 Jan 2008 16:56:38 -0800
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Thread-topic: HVM Multi-Processor Performance followup

Hi everyone,

 

A follow-up on the multiprocessor performance benchmark on HVM guests.

 

We ran the RE-AIM7 benchmarks on a 5-cell (40 CPU) machine and a single-cell 8-cpu NEC machine.

 

Here are the jobs per minute maximums.

 

You can see the drop in performance starts to get really bad at about 9 CPUs and beyond.

 

Questions:

 

1.       What can I do to help improve this situation?

2.       Are there any other experiments I can run?

3.       What tools/profilers will help to gather more data here?

 

I am very interested in helping to solve this problem! Thanks for your ideas and suggestions.

 

Best regards,

 

---Kayvan

 

 

Xen performance comparison on 5-Cell NEC machine (each cell with 4 dual-core Itaniums)

CPUs

Native Jobs/Min

HVM Jobs/Min

Overhead

1

2037

1791

12.08%

2

4076

3615

11.31%

3

6090

5221

14.27%

4

8118

6839

15.76%

5

10119

8404

16.95%

6

12037

9949

17.35%

7

14106

11095

21.35%

8

15953

12360

22.52%

9

18059

13201

26.90%

10

20170

13742

31.87%

11

21896

13694

37.46%

12

24079

13331

44.64%

13

25992

12374

52.39%

14

28072

11684

58.38%

15

29931

11032

63.14%

16

31696

10451

67.03%

The guest OS was CentOS-4.6 with 2GB of memory,

running under a Dom0 that was limited to 1 VCPU.

 

Xen performance comparison on 1-Cell NEC machine (4 dual core Itanium Montecito)

CPUs

Native Jobs/Min

HVM Jobs/Min

Overhead

1

2037

1779

12.67%

2

4067

3619

11.02%

3

6097

5344

12.35%

4

8112

7004

13.66%

5

10145

8663

14.61%

6

12023

10213

15.05%

7

14083

11249

20.12%

8

16182

12969

19.86%

The guest OS was CentOS-4.6 with 2GB of memory,

running under a Dom0 that was limited to 1 VCPU.


Powered by EditGrid - Online Spreadsheets

Source: CPU Performance

 

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