Gluster users - Oct 2012 - samba performance downgrade with glusterfs backend

Hi folks,

We found that samba performance downgrade a lot with glusterfs backend. volume
info as followed,
Volume Name: vol1
Type: Distribute
Status: Started
Number of Bricks: 1
Transport-type: tcp
Bricks:
Brick1: pana53:/data/
Options Reconfigured:
auth.allow: 192.168.*
features.quota: on
nfs.disable: on

Use dd (bs=1MB) or iozone (block=1MB) to test write performance,  about 400MB/s.
#dd if=/dev/zero of=dd.dat bs=1MB count=1k
1024+0 records in
1024+0 records out
1024000000 bytes (1.0 GB) copied, 2.6142 s, 392 MB/s

But exporting with samba, use 4 Win7 clients to test with SANergy/Iometer, write
performance only about 170MB/s.
Command line used: iozone -s 1g -r 1m -i 0 -t 4
Output is in Kbytes/sec
Time Resolution = 0.000001 seconds.
Processor cache size set to 1024 Kbytes.
Processor cache line size set to 32 bytes.
File stride size set to 17 * record size.
Throughput test with 4 processes
Each process writes a 1048576 Kbyte file in 1024 Kbyte records

Children see throughput for  4 initial writers  =  171295.03 KB/sec
Parent sees throughput for  4 initial writers   =  170732.54 KB/sec
Min throughput per process                      =   42684.70 KB/sec 
Max throughput per process                      =   42991.59 KB/sec
Avg throughput per process                      =   42823.76 KB/sec
Min xfer                                        = 1041408.00 KB

#smb.conf 
[global]
    log file = /var/log/samba/log.%m
    max log size = 50
    guest account = nobody
    map to guest = bad password
    posix locking = no
    max protocol = SMB2
    socket options = TCP_NODELAY IPTOS_LOWDELAY
[test]
    comment = None 
    path = /mnt/glusterfs
    browseable = yes
    read only = no
    hosts allow = 
    hosts deny = 
    guest ok = yes

Anyone meet such issues? 
thanks a lot




nuaa_liuben
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