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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Poor SMP performance pv_ops domU
Hi,
Over the last year we have tried many times to get acceptable performance from
pv_ops kernels.
Tests done with 1,2,4 and 8 cores. The more cores the lower the score.
Inside the domU it shows all cores, top -s shows all cores in use.
xentop in dom0 never shows over 99% cpu.
2.6.18.8-xenU kernel show's over 700% cpu and the scores are about 8 x the
pv_ops score.
Any ideas ?
John
1 core
BYTE UNIX Benchmarks (Version 4.1-wht.2)
System -- Linux test 2.6.32-21-server #32-Ubuntu SMP Fri Apr 16 09:17:34 UTC
2010 x86_64 GNU/Linux
/dev/xvda1 141110136 1066476 132875660 1% /
Start Benchmark Run: Tue May 18 13:54:54 BST 2010
13:54:54 up 0 min, 1 user, load average: 0.00, 0.00, 0.00
End Benchmark Run: Tue May 18 14:06:12 BST 2010
14:06:12 up 11 min, 2 users, load average: 11.48, 5.20, 2.43
INDEX VALUES
TEST BASELINE RESULT INDEX
Dhrystone 2 using register variables 376783.7 8950813.0 237.6
Double-Precision Whetstone 83.1 2103.7 253.2
Execl Throughput 188.3 1568.4 83.3
File Copy 1024 bufsize 2000 maxblocks 2672.0 64198.0 240.3
File Copy 256 bufsize 500 maxblocks 1077.0 17781.0 165.1
File Read 4096 bufsize 8000 maxblocks 15382.0 643717.0 418.5
Pipe-based Context Switching 15448.6 85379.4 55.3
Pipe Throughput 111814.6 478490.1 42.8
Process Creation 569.3 3329.6 58.5
Shell Scripts (8 concurrent) 44.8 380.7 85.0
System Call Overhead 114433.5 498712.3 43.6
=========
FINAL SCORE 114.1
2-cores
==============================================================
BYTE UNIX Benchmarks (Version 4.1-wht.2)
System -- Linux test 2.6.32-21-server #32-Ubuntu SMP Fri Apr 16 09:17:34 UTC
2010 x86_64 GNU/Linux
/dev/xvda1 141110136 1066548 132875588 1% /
Start Benchmark Run: Tue May 18 14:07:27 BST 2010
14:07:27 up 0 min, 1 user, load average: 0.00, 0.00, 0.00
End Benchmark Run: Tue May 18 14:18:04 BST 2010
14:18:04 up 10 min, 1 user, load average: 12.78, 5.53, 2.49
INDEX VALUES
TEST BASELINE RESULT INDEX
Dhrystone 2 using register variables 376783.7 10124838.6 268.7
Double-Precision Whetstone 83.1 1188.7 143.0
Execl Throughput 188.3 1596.2 84.8
File Copy 1024 bufsize 2000 maxblocks 2672.0 58323.0 218.3
File Copy 256 bufsize 500 maxblocks 1077.0 17776.0 165.1
File Read 4096 bufsize 8000 maxblocks 15382.0 568217.0 369.4
Pipe-based Context Switching 15448.6 86111.3 55.7
Pipe Throughput 111814.6 469957.8 42.0
Process Creation 569.3 3298.1 57.9
Shell Scripts (8 concurrent) 44.8 378.9 84.6
System Call Overhead 114433.5 532828.4 46.6
=========
FINAL SCORE 107.9
4-cores
==============================================================
BYTE UNIX Benchmarks (Version 4.1-wht.2)
System -- Linux test 2.6.32-21-server #32-Ubuntu SMP Fri Apr 16 09:17:34 UTC
2010 x86_64 GNU/Linux
/dev/xvda1 141110136 1066628 132875508 1% /
Start Benchmark Run: Tue May 18 14:19:17 BST 2010
14:19:17 up 0 min, 1 user, load average: 0.00, 0.00, 0.00
End Benchmark Run: Tue May 18 14:29:53 BST 2010
14:29:53 up 10 min, 1 user, load average: 13.59, 6.35, 2.97
INDEX VALUES
TEST BASELINE RESULT INDEX
Dhrystone 2 using register variables 376783.7 10185429.8 270.3
Double-Precision Whetstone 83.1 759.8 91.4
Execl Throughput 188.3 1386.2 73.6
File Copy 1024 bufsize 2000 maxblocks 2672.0 62331.0 233.3
File Copy 256 bufsize 500 maxblocks 1077.0 16492.0 153.1
File Read 4096 bufsize 8000 maxblocks 15382.0 563402.0 366.3
Pipe-based Context Switching 15448.6 87176.0 56.4
Pipe Throughput 111814.6 481068.1 43.0
Process Creation 569.3 3128.9 55.0
Shell Scripts (8 concurrent) 44.8 394.9 88.1
System Call Overhead 114433.5 539996.1 47.2
=========
FINAL SCORE 102.6
8-cores
==============================================================
BYTE UNIX Benchmarks (Version 4.1-wht.2, 8 threads)
System -- Linux test 2.6.32-21-server #32-Ubuntu SMP Fri Apr 16 09:17:34 UTC
2010 x86_64 GNU/Linux
/dev/xvda1 141110136 1066680 132875456 1% /
Start Benchmark Run: Tue May 18 14:30:59 BST 2010
14:30:59 up 0 min, 1 user, load average: 0.07, 0.02, 0.00
End Benchmark Run: Tue May 18 14:42:52 BST 2010
14:42:52 up 12 min, 1 user, load average: 25.56, 10.84, 4.96
INDEX VALUES
TEST BASELINE RESULT INDEX
Dhrystone 2 using register variables 376783.7 9972130.3 264.7
Double-Precision Whetstone 83.1 755.2 90.9
Execl Throughput 188.3 1584.7 84.2
File Copy 1024 bufsize 2000 maxblocks 2672.0 58981.0 220.7
File Copy 256 bufsize 500 maxblocks 1077.0 16904.0 157.0
File Read 4096 bufsize 8000 maxblocks 15382.0 557735.0 362.6
Pipe-based Context Switching 15448.6 80738.2 52.3
Pipe Throughput 111814.6 450891.2 40.3
Process Creation 569.3 2948.5 51.8
Shell Scripts (8 concurrent) 44.8 378.1 84.4
System Call Overhead 114433.5 537443.2 47.0
=========
FINAL SCORE 100.9
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