My samba server is 3.0.28a running on RHEL 4.
My network is also 100Mbps. I copy a 100MB file from Windows XP to my
samba server in about 20 seconds. Scp the same file from a Linux host
to the same server takes about the same time.
You may take a look at setting the Windows TCP buffer sizes. I did not
change mine though.
Raghu A wrote:
I tried TCP_NODELAY and it didn't make a difference. I haven't tried
SO_SNDBUF and RCVBUF, but I will. As the tcpdump shows there is lot of tcp
window left.
It is not just the server since linux samba client behaves much better. What
determines SMB packet size?
What is the throughput you get? Is this with an XP/windows client?
Raghu.
John Du-4 wrote:
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.
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