[Samba] Transfer rates faster than 23MBps?

[Mark Smith]

Mark Smith wrote:
> As a data point, I'm going to try a newer version of Samba.  (RHEL4 uses 
> 3.0.10-RedHat-Heavily-Modified-Of-Course)  If that makes a difference, 
> then I have to decide whether it's worth it to me to keep RedHat support 
> or not.  (And when I say "I," I really mean "my management.")

I've just tried this.  Samba v3.0.23c, built locally from the Fedora 
Source RPM as distributed at samba.org, makes no noticeable difference: 
  still about 45 seconds.

>> I have lots of memory.  I use these configurations in sysctl.conf to 
>> up the performance of send/recieve windows on my systems.  There's 
>> articles out there.  I don't have historical references handy.
>> YMMV.
>> net.core.wmem_max = 1048576
>> net.core.rmem_max = 1048576
>> net.ipv4.tcp_wmem = 4096 65536 1048575
>> net.ipv4.tcp_rmem = 4096 524288 1048575
>> net.ipv4.tcp_window_scaling = 1
> 
> I have not tried tweaking the TCP stack in the OS.  I'll give that a shot.

The person at RedHat who's handling my ticket just suggested these very 
changes, without the last one.  They did not help.  The values he gave 
were a little different:

----- snip! -----
# increase TCP maximum buffer size
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216

# increase Linux autotuning TCP buffer limits
# min, default, and maximum number of bytes to use
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
----- snip! -----

I also tried your values, with the tcp_window_scaling, with no luck.

-Mark