ext3 sequential write thoughput degrades in 2.5.72-mm1

Steven Pratt (slpratt@austin.ibm.com)
Mon, 23 Jun 2003 11:48:04 -0500


Compared with 2.5.72 the mm1 tree drops off on sequential write
throughput for ext3. All other filesystems seem unaffected. This
degrade stays in mm2 and mm3. Do not have the data from 2.5.73 yet.
Full data can be found at:
http://ltcperf.ncsa.uiuc.edu/data/2.5.72-mm1/2.5.72-vs-2.5.72-mm1/

tolerance = 1.00 + 3.00% of 2.5.72
2.5.72 2.5.72-mm1
Theads MBs/sec MBs/sec %diff diff tolerance
---------- ------------ ------------ -------- ------------ ------------
1 42.98 43.54 1.30 0.56 2.29
16 11.04 6.08 -44.93 -4.96 1.33 *
64 3.88 2.61 -32.73 -1.27 1.12 *

Results:Sequential Write CPU (Graph)

tolerance = 1.00 + 3.00% of 2.5.72
2.5.72 2.5.72-mm1
Theads %CPU %CPU %diff diff tolerance
---------- ------------ ------------ -------- ------------ ------------
1 53.32% 51.76% -2.93 -1.56 2.60
16 119.6% 86.11% -28.00 -33.49 4.59 *
64 37.23% 25.05% -32.72 -12.18 2.12 *

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