[Samba] Very slow transfers to Samba on Ubuntu

[Raghu A]

There is no disk or CPU bottleneck or virus checking (server is latest
ubuntu). scp at the same time as this transfer can write 3-4 faster to the
same partition. This is an Atom processor but there is more cpu left.

To be more specific:

Why does XP send only 1KB at a time to the server? I think this is pretty
much the culprit. I can send decoded TCP dump of initial SMB handshake if
you are interested. There seems to be some configuration mismatch.

When I tried a Ubuntu samba client it sends 4KB SMB packets. This helps a
lot with the transfer rate. Btw, looks like most of the CPU consumed by smbd
is per packet.. so inceasing this packet size reduces CPU as well.

Raghu.


Ben Tyger wrote:
> 
> What type of file processors are you running along with samba?. Are you
> running the virus checking plugin or VFS(recycle bin)? Virus checking is
> very cpu and disk I/O intensive these can really slow down a samba
> server. I can't expect VFS is all that cheap either when moving big files.
> 
> Raghu A wrote:
>>> I mounted a samba volume on XP. XP and Ubuntu are connected over 100Mbps
>>> ethernet (router).
>>>
>>> I am writing a 4GB file from XP to Ubuntu and the transfer is extremely
>>> slow : only around 1-1.5 MB/s.
> 
> 

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