From owner-freebsd-fs@FreeBSD.ORG  Fri Apr 27 20:22:18 2007
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Date: Fri, 27 Apr 2007 22:22:22 +0200
From: =?iso-8859-1?Q?St=E5le?= Kristoffersen <staalebk@ifi.uio.no>
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Subject: ZFS performance
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I'm having trouble with performance using ZFS as the filesystem.
I earlier ran UFS and had no problems pushing 50MB/s trough the network.
Now with ZFS i even have problems reading 15MB/s locally. From the output
of iostat and zpool iostat it looks like it reads about 2 times as much
data from the disc compared to how much the program receive. (using dd, ftp
or samba)

Is there anything I could check? I've tried some sysctl settings:
kern.ipc.shm_use_phys=1
vfs.vmiodirenable=1
vfs.hirunningspace=10485760
vfs.lorunningspace=10485760
net.inet.tcp.sendspace=65536
net.inet.tcp.recvspace=65536
net.inet.tcp.delayed_ack=0

but that did not do much difference.
-- 
Ståle Kristoffersen
staalebk@ifi.uio.no