[jcifs] JCIFS WAN performance vs. Windows

[mark at markfalk.com]

I confirmed it by looking at the network trace. I had another server where I could see it was using SMB2. There are registry settings to disable SMB 2 and 3, but in this case I didn’t touch those.


Mark






From: M. D.
Sent: ‎Thursday‎, ‎December‎ ‎11‎, ‎2014 ‎6‎:‎32‎ ‎AM
To: Mark Falk
Cc: jcifs at lists.samba.org





 Hello Mark,

We too are experiencing performance issues with NetApp Filer. 

We were thinking that it's because NetApp Filer has a crappy SMB 1 support and also because SMB 1 is slower by design but we might be wrong.

Can you please tell me how do you know that your windows client is using SMB1? Did you disable SMB 2 and 3? Did you restart after that?

Best regards,
M.D


 >-------- Оригинално писмо --------
 >От:  Mark Falk 
 >Относно: [jcifs] JCIFS WAN performance vs. Windows
 >До: jcifs at lists.samba.org
 >Изпратено на: Четвъртък, 2014, Декември 11 03:00:54 EET
 >
 >
 >I'm working on a project which is using JCIFS to copy a single 40 MB file 
 >across a WAN with 70ms latency. The server is a NetApp Filer. I've tweaked 
 >about every parameter I can, but I can't get above 4 Mbps on Linux, 
 >whereas using a simple copy command on a Windows 2008R2 client I'm seeing 
 >30 Mbps. Both are using SMB 1.0. I've upped the MPX count and snd_buf_size 
 >to match Windows.
 >
 >Linux command line:
 >/usr/local/java/jdk_8u5_x64/bin/java -classpath ./jcifs_1.3.17/jcifs-
 >1.3.17.jar:. -Djcifs.smb.client.snd_buf_size=33028 -
 >Djcifs.smb.client.maxMpxCount=50 -Djcifs.util.loglevel=3 -
 >Djcifs.resolveOrder=DNS -Djcifs.smb.client.dfs.disabled=true TestJavaCopy 
 >
 >Graphs:
 >JCIFS:
 >http://i.imgur.com/Zl386qK.png
 >
 >Native 2008R2 client using "copy \\UNCPATH :":
 >http://i.imgur.com/MIFcr39.png
 >
 >Any thoughts?  Packet details available upon request.
 >
 >Thanks,
 >Mark
 >
 >
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