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

Mike Tancsa mike at sentex.net
Wed Oct 27 19:36:46 UTC 2010


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

I ran the file io tests again 5 times

RELENG7,
Operations performed:  6000 Read, 4000 Write, 12672 Other = 22672 Total
Read 93.75Mb  Written 62.5Mb  Total transferred 156.25Mb  (6.1136Mb/sec)
   391.27 Requests/sec executed

Test execution summary:
     total time:                          25.5578s
     total number of events:              10000
     total time taken by event execution: 12.0346
     per-request statistics:
          min:                                  0.01ms
          avg:                                  1.20ms
          max:                                101.39ms
          approx.  95 percentile:               4.77ms

Threads fairness:
     events (avg/stddev):           625.0000/97.89
     execution time (avg/stddev):   0.7522/0.15

RELENG7
times for 5 runs
25.5578
26.5351
25.5734
27.0934
26.6094


RELENG8, ATA driver
times for 5 runs
28.9372
27.3766
29.3507
28.3406
28.0904


RELENG7 throughput (MB/s)
6.1136
5.8884
6.1099
5.7671
5.8720
RELENG_8 ATA throughput (MB/s)
5.3996
5.7074
5.3236
5.5133
5.5624


  ministat -s -w 60 7 8
x 7
+ 8
+------------------------------------------------------------+
|+     +       +   +          +   x       xx                x|
|                                   |______M____A__________| |
|  |__________AM_________|                                   |
+------------------------------------------------------------+
     N           Min           Max        Median           Avg        Stddev
x   5        5.7671        6.1136        5.8884        5.9502    0.15464778
+   5        5.3236        5.7074        5.5133       5.50126     0.1485552
Difference at 95.0% confidence
         -0.44894 +/- 0.221147
         -7.54496% +/- 3.71663%
         (Student's t, pooled s = 0.151632)



--------------------------------------------------------------------
Mike Tancsa,                                      tel +1 519 651 3400
Sentex Communications,                            mike at sentex.net
Providing Internet since 1994                    www.sentex.net
Cambridge, Ontario Canada                         www.sentex.net/mike



More information about the freebsd-performance mailing list