[Samba] Samba fileserver limited to 50 MB/s on gbit

Jean-Vincent BAYARRI bayarri at lcpc.fr
Mon Nov 20 11:31:53 GMT 2006


did you force your interfaces in full-duplex mode?
(use the mii-tool package for your debian and the advanced options for
your NIC card under windows)

I had poor performance issues between a FreeBSD server and WinXP client
(around 6 Mb/s for a 100 Mb link), and I greatly improved it (around
70-80 Mbps) after forcing the FD mode. (sometimes intermediate switches
do not properly perform autoneg)

Le Mon, Nov 20, 2006 at 12:23:25PM +0100, Leo B. a écrit :
> Hello,
> I am running a fileserver with smbd here.
> The server is a 64bit 2.8 GHz Celeron D with 2GB RAM, running 64bit Debian, 
> Samba version 3.0.23c.
> It is running as a pure fileserver so its only CPU load is serving files.
> The client I am doing the tests from is WinXP Pro SP2.
> It is connected via Intel e1000 gbit ethernet (both the server and client 
> use e1000 chipsets).
> I have done a raw tcp benchmark (using netio) and the network IS capable of 
> transferring 120 MB/s.
> The problem is: The maximal transferrate when reading from the fileserver is
> limited to almost exactly 50 MB/s.
> The 50 MB/s are reached when the file I'm using for the benchmark is 
> completely cached in the fileserver's RAM.
> CPU usage while reading:
> smbd is using around 10%, top says:
> Cpu(s):  2.0%us,  6.0%sy,  0.0%ni, 82.0%id,  0.0%wa,  0.0%hi, 10.0%si,
> 0.0%st
> The only network option my smb.conf contains is:
> - which is everything I could google for optimizing the samba network speed.
> I have this problem since I set up the fileserver almost a year ago, my 
> debian packages have always been up to date.
> I also tested it with a friend's notebook with a new XP installation and did
> not get over 50 MB/s so I doubt that my XP is borked.
> Can someone please investigate this issue?
> I am willing to help testing.
> Thanks, Leo B.
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* Jean-Vincent BAYARRI                         Ingénieur système & réseau *
* Service Informatique         Laboratoire Central des Ponts et Chaussées *
* 58, boulevard Lefebvre                             75732 PARIS CEDEX 15 *
* Tel 01 40 43 51 70                                   Fax 01 56 56 16 99 *

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