Hi Andrew et al.
I have run my 'production database load' against the 2.5.59-mm7 kernel.
Fortunately for me, but unfortunately for you, I have upgraded the system
CPUs. They were 2 x PIII 866Mhz, 256kb cache, now 2 x PIII 1Ghz, 256kb
cache. I reran the 2.4.18-19.7.xsmp test as a baseline for comparison. I
include all results to date here. System and workload descriptions
The (slight) advantage that the 2.5.59 series had over the RedHat
kernels has evaporated. But it was marginal to begin with.
As usual, I'm willing to test...
old cpus, 2x866mhz:
new cpus, 2x1ghz:
2.4.18-19.7.xsmp 118 <--- new run
2.5.59-mm7 118 <--- new run
Platform and configuration:
HP LH3000 U3. Dual 1Ghz Intel Pentium III, 2GB ram. megaraid controller
with two channels, each channel raid 5 (hardware raid) PV on 6 15k scsi
disks, one megaraid LV per PV.
Two plain disks w/pairs of partitions in raid 1 for OS (redhat 7.3), a
second pair of partitions (regular partitions with ext2) for Oracle
redo-log (in a log 'group').
Oracle version 184.108.40.206 (no aio support in this release) is accessing
datafiles on the two megaraid devices via /dev/raw stacked on top of
The workload consists of a few different phases.
1) Indexing: multiple indexes built against a 9 million row table. This
is mostly about sequential scans of a single table, with bursts of write
activity. 50 minutes or so.
2) Analyzing: The database scans tables and
builds statistics. Most of the time is spent analyzing the 9 million row
table. This is a completely cpu bound step on our underpowered system.
3) Summarization: the large table is aggregated in about 100
different ways. Records are generated for each different summarization.
This is mixed read-write load. 50 minutes or so.
| David Mansfield |
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