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

[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.
On Jan 5, 2009, at 10:44 AM, Low Tee Chong wrote:

> 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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