Messages in this thread | | | Date | Tue, 24 Jun 2003 15:28:04 -0700 | From | "Martin J. Bligh" <> | Subject | [Bug 849] New: [perf][tiobench] tiobench sequential write degrades in 2.5.72-bk2 |
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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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