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Subject[Bug 849] New: [perf][tiobench] tiobench sequential write degrades in 2.5.72-bk2
http://bugme.osdl.org/show_bug.cgi?id=849

Summary: [perf][tiobench] tiobench sequential write degrades in
2.5.72-bk2
Kernel Version: 2.5.72-bk2
Status: NEW
Severity: high
Owner: akpm@digeo.com
Submitter: slpratt@us.ibm.com


Hardware Environment: 8way 900mhz adaptec scsi drives

Software Environment: sles8.0 + 2.5 kernel

Problem Description:

tiobench sequential write throughput drops between 2.5.72-bk1 and 2.5.72-bk2 for
multi threaded IO.

tolerance = 1.00 + 5.00% of 2.5.72-bk1
2.5.72-bk1 2.5.72-bk2
Theads MBs/sec MBs/sec %diff diff tolerance
---------- ------------ ------------ -------- ------------ ------------
1 43.27 42.90 -0.86 -0.37 3.16
16 11.86 4.35 -63.32 -7.51 1.59 *
64 3.95 2.50 -36.71 -1.45 1.20 *


Results:Sequential Write CPU (Graph)

tolerance = 1.00 + 3.00% of 2.5.72-bk1
2.5.72-bk1 2.5.72-bk2
Theads %CPU %CPU %diff diff tolerance
---------- ------------ ------------ -------- ------------ ------------
1 52.87% 50.78% -3.95 -2.09 2.59
16 127.6% 49.03% -61.58 -78.57 4.83 *
64 37.51% 22.15% -40.95 -15.36 2.13 *


http://ltcperf.ncsa.uiuc.edu/data/2.5.72-bk2/2.5.72-bk1-vs-2.5.72-bk2/
Folloow link for tiobench.ext3 summary report and full results.

Steps to reproduce:
tiobench --dir /mnt/tmp --block 4096 --size 600 --numruns 10 --threads 16

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