[Samba] slow throughput on 1gbit lan

[Volker Lendecke]

On Mon, Mar 02, 2009 at 05:33:49PM +0100, Tomasz Lutelmowski wrote:
> Hello,
> 
> I'm trying to squeeze out maximum possible transfer between two Samba 3.3.1
> servers. Both servers and switch supports jumbo frames, network link and
> disks does not appear to be bottleneck, between these two servers FTP
> transfer rates are about 115MB/s (1gbit link is saturated at this point) -
> and I'd like to see similar transfer from Samba (now I get half of it).
> 
> 10.0.0.5 # wget ftp://10.0.0.2/1G
> 100%[=================================================================================================================>]
> 1,048,576,000  118M/s   in 8.5s
> 2009-02-27 09:16:00 (118 MB/s) - `1G' saved [1048576000]
> 
> 
> Also testing samba locally, it gives me transfer via loopback of over
> 300MB/s
> 
> 10.0.0.2 # smbclient '\\10.0.0.2\test\' xxx -U xxx -c 'GET 1GB'
> WARNING: The "write cache size" option is deprecated
> Domain=[EPW] OS=[Unix] Server=[Samba 3.3.1]
> getting file \1GB of size 1048576000 as 1GB (331177.2 kb/s) (average
> 331177.2 kb/s)
> 
> 
> Now, when I try to get this file from another server (10.0.0.5), maximum
> transfer drops to 55MB/s....
> 
> 10.0.0.5 # smbclient '\\10.0.0.2\test\' xxx -U xxx -c 'GET 1GB'
> Domain=[EPW] OS=[Unix] Server=[Samba 3.3.1]
> getting file \1GB of size 1048576000 as 1GB (55664.3 kb/s) (average 55664.3
> kb/s)
> 
> 
> So far, I was turning these knobs:
> 
> socket options = TCP_NODELAY SO_RCVBUF=262144 SO_SNDBUF=262144
> max xmit = 131072
> block size = 4096
> aio read size = 1
> aio write size = 1
> use mmap = No
> use sendfile = Yes
> blocking locks = No

What do you get without any of these? And, are you 100% sure
you've got a 3.3.1 smbclient?

Volker
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