[Bug 15688] mptsas & poor performance

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https://bugzilla.kernel.org/show_bug.cgi?id=15688


Albert Strasheim <fullung@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |fullung@gmail.com




--- Comment #7 from Albert Strasheim <fullung@gmail.com>  2010-04-29 08:35:27 ---
I've been seeing a similar issue with a LSI 1068 connected to a Sun J4400 JBOD.
Solaris can drive a single 4-port PHY (12Gb/s) at about 1000 MB/sec but Linux
maxes out at 830 MB/sec running 2.6.32 included with RHEL 6 beta.

As I write to more disks at the same time, the throughput (MB/sec) per disk
starts dropping after the 7th disk:

#disks  thruput  tpdelta  tp/disk expected tp
1     82     0     82.00    82
2     165    83    82.50    164
3     248    83    82.67    246
4     331    83    82.75    328
5     413    82    82.60    410
6     494    81    82.33    492
7     578    84    82.57    574
8     623    45    77.88    656
9     643    20    71.44    738
10    659    16    65.90    820
11    671    12    61.00    902
12    681    10    56.75    984 

I'll do some tests with 4.22.00.00 now.

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