[Samba] Very slow transfers to Samba on Ubuntu

[John Du]

Have you looked at adjusting the "socket options" parameter in smb.conf?

I use "socket options = TCP_NODELAY SO_SNDBUF=8192 SO_RCVBUF=8192" in my 
smb.conf and scp and samba take about the same amount of time to 
transfer files from Windows to the samba server.

Raghu A wrote:
> 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.
>>>>         
>>     
>
>