I'm running Samba 3.0.24 as PDC and file server on Gentoo Linux, AMD64,
2.6.19 kernel, 100MBit/s network, and experience quite slow file
transfers from Samba to WinXP SP2 clients: the speed is varying, but is
about 1-2Mb/s at best.
I'm assuming for the rest of this that you mean MB/sec not Mb/sec when
referencing transfer speeds...
b) Transfering to/from Samba server from Gentoo Linux on the same PC
where WinXP is installed (so, completely the same hardware and
connection) is also at normal speed.
So, you are running something in a VM?
c) Transferring to/from WinXP to the server where Samba is installed
using any other protocol (such as HTTPS or SCP) is also at normal speed.
Define 'normal'...
2) CPU is at almost idle level both at client and server, so it's not
the issue.
3) If there is any other network activity, transfer speed is increased
up to normal level: f.e. doing two simulteneous transfers from Samba
server to WinXP client gives 5Mb/s at each transfer, as expected.
Again, define 'normal'?
100Mb network connections should give @ 12MB/sec transfer speeds, no? So
5MB/sec speeds are certainly not 'normal'.
4) Running tcpdump on server while the transfer is performed improves
transfer speed in about 1.5 - 3 times, but still not to the normal speed.
TCP dumps are fine, but you neglected to provide the most important
thing for initial troubleshooting assistance: where is your config?
5) Playing with "socket options" does not give any results.
Modern linux kernels (2.6+) do *not* need to have these values tuned, so
it is recommended to not set them *at* *all*. Just delete these entries.
Specifically, using advices from the article
http://www.dd.iij4u.or.jp/~okuyamak/Documents/tuning.english.html about
SO_SNDBUF does not improve situation (but read below).
Well, since this article is dated from 2000, I don't think I'd trust it
much.
6) tcpdump + tcptrace show that there are a lot of retransmissions, see
dumps below.
7) I've tested several WinXP clients with different hardware, all with
the same results.
What about the NIC on the Samba server? If all clients are affected the
same, then that is the NIC you should focus on (if it is indeed a
hardware issue).
8) Samba logs looks normal to me, nothing special.
Points (3) and (5), and also the article about SO_SNDBUF tuning gave me
an idea that there might be smth wrong with ACKs sent from WinXP.
I think you need to go back to square one, and start over, but with up
to date references - like the excellent 'Samba-3 By Example' and/or 'The
Official Samba-3 HOWTO and Reference Guide'.
It seems that I'm not the only one who have similar problems: see BUGs
2117 and 3706 in Bugzilla, and discussion at Gentoo mailing list:
http://forums.gentoo.org/viewtopic-p-2820556.html
This too is an old(er) thread - and it specifically mentions switching
from smbfs to cifs as the best solution...
--
Best regards,
Charles
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