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high load caused by I/O - a hint

From: eleven <eleven(at)ludojad(dot)itpp(dot)pl>
To: pgsql-performance(at)postgresql(dot)org
Subject: high load caused by I/O - a hint
Date: 2004-08-18 08:18:19
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance

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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Subject: Re: high load caused by I/O - a hint
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