Date: Thu, 24 Feb 2011 08:30:17 +0100 From: Damien Fleuriot <ml@my.gd> To: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org> Subject: ZFS - abysmal performance with samba since upgrade to 8.2-RELEASE Message-ID: <4D660909.6090202@my.gd>
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Hello list,
I've recently upgraded my home box from 8.2-PRE to 8.2-RELEASE and since
then I've been experiencing *abysmal* performance with samba.
We're talking transfer rates of say 50kbytes/s here, and I'm the only
client on the box.
I've seen here and there discussions about sendfile's support, and how
it is recommended to disable it in samba.
Now, the man tells us:
Default: use sendfile = false
On the other side, FTP and SFTP transfers are OK, at 20mbytes/s or so.
Find below a bit of info
smb.conf
---
[global]
workgroup = MYGROUP
server string = Samba Server
security = user
hosts allow = 192.168.0.1 192.168.1.1 fe80::1
load printers = no
log file = /var/log/samba/log.%m
max log size = 50
# You may want to add the following on a Linux system:
socket options = SO_RCVBUF=8192 SO_SNDBUF=8192
dns proxy = no
bind interfaces only = yes
interfaces = re0 lagg0
hide unreadable = yes
[homes]
comment = Home Directories
browseable = no
writable = yes
loader.conf
---
# Tune ZFS somewhat aye ?
vm.kmem_size="3072M"
vm.kmem_size_max="3072M"
vfs.zfs.arc_min="128M"
vfs.zfs.arc_max="2048M"
vfs.zfs.txg.synctime="1"
vfs.zfs.prefetch_disable="0"
vfs.zfs.vdev.min_pending="4"
vfs.zfs.vdev.max_pending="8"
ZFS pool
---
nas# zpool status
pool: rtank
state: ONLINE
status: The pool is formatted using an older on-disk format. The pool can
still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'. Once this is done, the
pool will no longer be accessible on older software versions.
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
rtank ONLINE 0 0 0
raidz2 ONLINE 0 0 0
gpt/zfs-ada0 ONLINE 0 0 0
gpt/zfs-ada1 ONLINE 0 0 0
gpt/zfs-ada2 ONLINE 0 0 0
gpt/zfs-ada3 ONLINE 0 0 0
gpt/zfs-ad14 ONLINE 0 0 0
gpt/zfs-ad10 ONLINE 0 0 0
gpt/zfs-ad11 ONLINE 0 0 0
gpt/zfs-ad12 ONLINE 0 0 0
gpt/zfs-ad13 ONLINE 0 0 0
zpool version 14
zfs version 3
So mmmm, sendfile disabled, ZFS pool not quite updated, good FTP/ssh
performance, horribad samba performance.
Does anyone have an idea of stuff I should be looking at ?
Again, this has only begun since I've upgraded from 8.2-PRE/RC3 to
8.2-RELEASE.
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