Subject: FFSv1 performance on large filesystems
To: None <tech-perform@NetBSD.org>
From: Matthias Scheler <tron@zhadum.de>
List: tech-perform
Date: 03/03/2005 13:05:51
Hello,
while searching for the reason for the "bad" NFS performance in my home
network I got interesting filesystem performance numbers
Filesystem Size Device Write Performance(*)
1.9G raid0 34MB/Sec
101G raid0 22MB/Sec <--
9.7G raid1 34MB/Sec
26G raid1 33MB/Sec
It looks like FFSv1 has a performance problem with large partitions. Any
ideas why that would happen? I wonder if it distributes the data too
much and therefore renders the 8MB cache of my IDE disks useless.
Kind regards
(*) Measured with "dd if=/dev/zero of=test.img bs=1024k count=256"
--
Matthias Scheler http://scheler.de/~matthias/