Possible evidence of performance regression for 8.1-S (vs. 7.1)

[Mike Tancsa]

At 03:36 PM 10/27/2010, Mike Tancsa wrote:
>At 01:05 PM 10/27/2010, Mike Tancsa wrote:
>>At 12:34 PM 10/27/2010, David Wolfskill wrote:
>>
>>>* release/7.1.0, with the following merged in:
>>>   r186860 from stable/7
>>>   r190970 from stable/7
>>>   r203072 from head
>>>   r209964 from stable/7
>>>   and using the MAC kernel config
>>>
>>>* stable/8 @r214029 using the GENERIC kernel config
>>
>>OK.
>>I was using GENERIC vs GENERIC from RELENG7 and RELENG8 from 
>>today.  MAC is in by default in RELENG_8


One bright spot on the file IO is the AHCI driver when the test is 
done with much larger data.  Instead of 3G of test data I ran 6G.... 
I am guessing AHCI does better due to the command re-ordering

RELENG8

Running the test with following options:
Number of threads: 16

Extra file open flags: 0
128 files, 48Mb each
6Gb total file size
Block size 16Kb
Number of random requests for random IO: 10000
Read/Write ratio for combined random IO test: 1.50
Periodic FSYNC enabled, calling fsync() each 100 requests.
Calling fsync() at the end of test, Enabled.
Using synchronous I/O mode
Doing random r/w test
Threads started!
Done.


RELENG8 (AHCI)
Operations performed:  6005 Read, 3995 Write, 12800 Other = 22800 Total
Read 93.828Mb  Written 62.422Mb  Total transferred 
156.25Mb  (2.306Mb/sec) 147.58 Requests/sec executed
Read 93.844Mb  Written 62.406Mb  Total transferred 
156.25Mb  (3.182Mb/sec) 203.68 Requests/sec executed
Read 93.75Mb   Written 62.5Mb    Total transferred 
156.25Mb  (5.039Mb/sec) 322.53 Requests/sec executed
Read 93.781Mb  Written 62.469Mb  Total transferred 
156.25Mb  (3.470Mb/sec) 222.12 Requests/sec executed
Read 93.719Mb  Written 62.531Mb  Total transferred 
156.25Mb  (4.839Mb/sec) 309.72 Requests/sec executed

vs
RELENG7
Read 93.781Mb  Written 62.469Mb  Total transferred 
156.25Mb  (1.52Mb/sec)   97.67 Requests/sec executed
Read 93.812Mb  Written 62.438Mb  Total transferred 
156.25Mb  (2.031Mb/sec) 130.00 Requests/sec executed
Read 93.781Mb  Written 62.469Mb  Total transferred 
156.25Mb  (1.834Mb/sec) 117.40 Requests/sec executed
Read 93.75Mb   Written 62.5Mb    Total transferred 
156.25Mb  (5.065Mb/sec) 324.16 Requests/sec executed
Read 93.797Mb  Written 62.453Mb  Total transferred 
156.25Mb  (4.960Mb/sec) 317.46 Requests/sec executed


         ---Mike






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Mike Tancsa,                                      tel +1 519 651 3400
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