Hello,
This is not strictly PostgreSQL performance hint, but may be helpful to someone with problems like mine.
As I earlier posted, I was experiencing very high load average
on one of my Linux database servers (IBM eServer 345, SCSI disks on LSI Logic controller) caused by I/O bottleneck.
INSERTs were really slow, even after many days of tweaking PostgreSQL configuration. The problem appeared to be in the Linux kernel itself - using acpi=ht and noapic boot parameters solved my performance problems. Load average dropped below 1.0 (before, it was as high as ten in peak) and the database works much, much faster.
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