[Samba] SMB throughput inquiry, Jeremy, and James' bow tie

L.P.H. van Belle belle at bazuin.nl
Tue Jul 30 03:28:15 MDT 2013


as compairison.
Running Ubuntu 12.04 LTS. kernel 3.2.0-(latest ubuntu kernel ) 
Samba 3.6.12 Sernet release. 

1 x ssd, top speed 400Mb/s ( reallife speeds ) 
2 x 5400 RPM disk in raid 1, mdraid aka software raid. 
Draytek 2850 with gigabit ports. 
Copy speed from server to pc. about 110-120MB/s  ( aka the speed i see in windows ) large files, like 2+ Gibabit files ) 
Copy speed from server to pc, about 40-80MB/s files from 1-50 Mb. 
Copy speed from server to pc, about 1-20MB/s  lots of small files  ( like 1kb-2Mb ) 

Tuning, windows side, 
Power schema, High performance  
disabled search indexing service.
and .  
netsh interface tcp set global autotuning=disabled 

Tuning samba side.
only, other settings are default. 
socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=131072 SO_SNDBUF=131072 

I suggest, upgrade your debian samba, to at lease 3.6.6 from backports.
Or use the sernet packages. 

I noticed a improvement in speed after this upgrade.

In my office i'm running samba 3.6.6 from backports on debian. 
On ubuntu im using the sernet packages 3.6.12 

Good luck. 


>-----Oorspronkelijk bericht-----
>Van: stan at hardwarefreak.com 
>[mailto:samba-bounces at lists.samba.org] Namens Stan Hoeppner
>Verzonden: dinsdag 30 juli 2013 9:27
>Aan: samba at lists.samba.org
>Onderwerp: [Samba] SMB throughput inquiry, Jeremy, and James' bow tie
>I went to the site to subscribe again and ended up watching some of
>Jeremy's Google interviews.  I particularly enjoyed the interview with
>James and the bow tie lesson at the end. :)
>So anyway, I recently upgraded my home network to end-to-end GbE.  My
>clients are Windows XP SP3 w/hot fixes, and my Samba server is 3.5.6
>atop vanilla kernel.org Linux 3.2.6 and Debian 6.0.6.
>With FDX fast ethernet steady SMB throughput was ~8.5MB/s.  
>throughput were ~11.5MB/s.  With GbE steady SMB throughput is ~23MB/s,
>nearly a 3x improvement, making large file copies such as ISOs much
>speedier.  However ProFTPd and Lighttpd throughput are both a steady
>~48MB/s, just over double the SMB throughput.
>I've tweaked the various Windows TCP stack registry settings,
>WindowScaling ON, Timestamps OFF, 256KB TcpWindowSize, etc.  
>Between two
>Windows machines SMB throughput is ~45MB/s.  You can see from the
>remarks below the various smb.conf options I've tried.  No 
>tweaking thus
>far of either Windows or Samba has yielded any improvement, at all.  It
>seems that regardless of tweaking I'm stuck at ~23MB/s.
># max xmit=65536
># read raw=yes
># large readwrite=yes
># aio read size=8192
>nt acl support=no
>client signing=disabled
>smb encrypt=disabled
># smb ports=139
>smb ports=445
>The Linux server has an Intel PRO/1000GT NIC, the clients motherboard
>embedded RealTek 8111/8169, the latter being the reason I'm limited to
>~50MB/s over the wire.
>I run nmbd via the standard init script at startup but I run smbd via
>inetd.  This doesn't appear to affect throughput.  I effect config
>changes with kill -HUP of inetd and killing smbd.
>I have Wireshark installed on one of the Windows XP machines, 
>though I'm
>a complete novice with it.  I assume a packet trace may be necessary to
>figure out where the SMB request/reply latency is hiding.
>~23MB/s is a marked improvement and I'm not intending to complain here.
> It just seems rather low given FTP/HTTP throughput.  I'm wondering how
>much of that ~48MB/s I'm leaving on the table, that could be coaxed out
>of Windows or smbd, the kernel, etc with some tweaking.
>I don't want to take up a bunch of anyone's time with this.  If you can
>just tell me what information you need in order to point me in 
>the right
>direction, I'll do my best to provide it with little fuss.
>Thanks again for providing such an invaluable piece of open source
>software to the world.
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