Hi guys,
I have spent many days on debuging read/write performance of glusterfs with
samba-gluster-vfs plugin recently. The write performance is okay, but the read
speed is always dispirited.
The testing environment is like this:
OS: centos 6.4
hosts: two hosts, one for samba server which glusterfs with
samba-glusterfs-vfs runs on it, the other for samba client
glusterfs version: 3.4.2
samba-glusterfs-vfs:
git://forge.gluster.org/samba-glusterfs/samba-glusterfs-vfs.git.
gluster volume type : Distributed
smb.conf:
large readwrite = yes
aio read size = 262144
aio write size = 262144
aio write behind = true
;min receivefile size = 262144
;write cache size = 268435456
read raw = yes
write raw = yes
max xmit = 262144
socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=262144
SO_SNDBUF=262144
kernel oplocks = no
stat cache = no
[gluster]
vfs objects = glusterfs
glusterfs:volume = test
glusterfs:volfile_server = localhost
browseable = yes
guest ok = yes
read only = no
writable = yes
path = /
public = yes
comment = For samba export of volume test
write list =
valid users = a2
Firstly, i mount the shared on client with command like this:
# mount -t cifs -o username=a2 //192.168.102.189/gluster /mnt
And then test read performance with dd command like this:
# dd if=/dev/zero of=/mnt/d1 bs=128k count=10240
the write speed : 350 - 420 MB
# dd if=/mnt/d1 of=/dev/null bs=128k count=10240
the read speed : 19 - 20 MB
The read speed is unbelievably slow.
When i modified the smb.conf to exporting glusterfs fuse mount directory
directly without using samba-glusterfs-vfs plugin, I got the performance
results as follows:
the write speed : 150 - 180 MB
the read speed : 62 - 64MB
In contrast with the result with samba-gluster-vfs, it looks like our plugin
reduced the read speed through CIFS.
Why is there such a situation? Where is the problem? Any reply will be
appreciated. Thanks very much!
with best regards!
lou.chen
_______________________________________________
Gluster-users mailing list
[email protected]
http://supercolony.gluster.org/mailman/listinfo/gluster-users
