From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 15688] mptsas & poor performance
Date: Thu, 29 Apr 2010 08:36:13 GMT
Message-ID: <201004290836.o3T8aDJ9006885@demeter.kernel.org>
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https://bugzilla.kernel.org/show_bug.cgi?id=15688
Albert Strasheim changed:
What |Removed |Added
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CC| |fullung@gmail.com
--- Comment #7 from Albert Strasheim 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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