Very low disk performance Highpoint 1820a

From: Steven Hartland (killing_at_multiplay.co.uk)
Date: 04/28/05

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    To: <freebsd-hackers@freebsd.org>, <freebsd-current@freebsd.org>
Date: Thu, 28 Apr 2005 15:18:33 +0100

    I've just finished putting together a new server box spec:
    Dual AMD 244, 2GB ram, 5 * Seagate SATA 400GB on a
    Highpoint 1820a RAID 5 array.
    The machine is currently running 5.4-STABLE ( from the
    weekend ) After install I did some basic tests and the
    disk is return very poor performance low in fact than a
    single disk on a bog standard ATA 100 controller:

    5.4-STABLE Highpoint 1820a RAID 5 ( 5 disk )
    dd if=/dev/da0 of=/dev/null bs=64k count=10000
    10000+0 records in
    10000+0 records out
    655360000 bytes transferred in 13.348032 secs (49097875 bytes/sec)

    5.3-RELEASE Highpoint 454 RAID 5 ( 4 disk )
    dd if=/dev/da0 of=/dev/null bs=64k count=10000
    10000+0 records in
    10000+0 records out
    655360000 bytes transferred in 20.410034 secs (32109697 bytes/sec)

    5.2.1-RELEASE Intel ICH3 UDMA100 ( 1 disk )
    dd if=/dev/ad0 of=/dev/null bs=64k count=10000
    10000+0 records in
    10000+0 records out
    655360000 bytes transferred in 11.142405 secs (58816745 bytes/sec)

    Obviously something is seriously a miss here somewhere as
    both the RAID 5 arrays a producing less throughput than
    a single disk.

    Where do I start looking?

        Steve

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