FreeBSD 5.3b7and poor ata performance

[Mike Tancsa]

At 03:06 PM 18/10/2004, Julian Elischer wrote:
>what are perfomrances when you don't go thrrough the filesystem?
>
>how fast is:
>dd if=/dev/ad0 of=/dev/null bs=128k count=10000

Just as a point of reference, on a 915 board with
915# atacontrol list
ATA channel 0:
     Master:      no device present
     Slave:       no device present
ATA channel 1:
     Master:  ad2 <ST3120026AS/3.18> Serial ATA v1.0
     Slave:       no device present

915# dd if=/dev/ad2 of=/dev/null bs=128k count=10000
10000+0 records in
10000+0 records out
1310720000 bytes transferred in 22.493172 secs (58271906 bytes/sec)
915#

915# uname -a
FreeBSD 915.sentex.ca 5.3-STABLE FreeBSD 5.3-STABLE #1: Mon Oct 18 10:08:54 
EDT 2004     mdtancsa at 915.sentex.ca:/usr/obj/usr/src/sys/915  i386
915#