executing pgsql on Xeon-dual machine

Hello,

I'm facing to a performance problem, when I run PostgreSQL 7.
2.1 + RedHat Linux 7.3 on a Xeon Dual CPU machine.

Compared with a P4 2.4GHz machine, pgbench shows 1/10 on the
Xeon machine (detail is describled below), while hdparm
shows 2 times faster.

Disabling HTT had no effects. PostgreSQL 7.2.3 is also slow
on the machine.

I'm grateful if any of you can give me an advice.

thank you.

data ---------------

[Hardware Profile]
DELL PowerEdge 2600
CPU Xeon 2GHz Dual
Memory 2GB PC2100 ECC DDR266 SDRAM
HDD 73GB 10,000rpm U320 SCSI

DELL PowerEdge 600SC (for comparison)
CPU Pentium 4 2.4GHz Single
Memory 1GB 400MHz ECC DDR SDRAM
HDD 80GB 7,200rpm EIDE

[pgbench result]

multiplicity | 1 | 128
--------------+-----+------
PE 600 |259.2|178.2 [tps]
PE 2600 | 22.9| 34.8 [tps]

- wal_sync_method(wal_method.sh) fsync
- 200,000 data items

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Yutaka Inada [Justsystem Corporation]