[Samba] poor read/write performance due to TCP window size configuration

[Low Tee Chong]

Hi,

I am using a TCP link that requires TCP window size to be at least 256K.

Below is my smb.conf file.
I have tried to capture the packets using wireshark after the configuration. However, the TCP windows size still cap at about 64k

How should I configure it? My samba version is Version 3.0.24-11.fc6

Thank You.

Best Regards,
Gary

[global]
workgroup = TESTBED
server string = Samba Server
security = user
log level = 0
read raw = yes
write raw = yes
kernel oplocks = yes
max xmit = 262144
dead time = 15
getwd cache = yes
encrypt passwords = yes
log file = /var/log/samba/%m.log
max log size = 50
smb passwd file = /etc/samba/smbpasswd
netbios name = stgsvr01
disable spoolss = yes
show add printer wizard = no
cups options = raw
socket options = TCP_NODELAY SO_RCVBUF=262144 SO_SNDBUF=262144 IPTOS_LOWDELAY

#============================ Share Definitions ==============
[teststg01]
path = /mnt/thumb
hosts allow = 192.168.37.199
delete readonly = yes
oplocks = yes
read only = no
browseable = yes
valid users = teststg01

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[Mike Gallamore]

I haven't played around with this much but I seem to recall reading
that things in packet/window size seem to work on a lowest common
denominator approach. Does something in the path not have the window
scale option enabled? The "old" standard had a max size for the window
of 64k. According to: http://en.wikipedia.org/wiki/TCP_window_scale_option

routers and firewalls are notorious for not implementing TCP Window
scaling.