[jcifs] JCIFS WAN performance vs. Windows

[Mark Falk]

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:
Loading Image...

Native 2008R2 client using "copy \\UNCPATH <localdir>:":
Loading Image...

Any thoughts? Packet details available upon request.

Thanks,
Mark

[M. D.]

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
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.
/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
http://i.imgur.com/Zl386qK.png
http://i.imgur.com/MIFcr39.png
Any thoughts? Packet details available upon request.
Thanks,
Mark

[Mark Falk]

Post by M. D.
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

Post by M. D.
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

Post by M. D.
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.
/usr/local/java/jdk_8u5_x64/bin/java -classpath

./jcifs_1.3.17/jcifs-

Post by M. D.

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

Post by M. D.

http://i.imgur.com/Zl386qK.png
http://i.imgur.com/MIFcr39.png
Any thoughts? Packet details available upon request.
Thanks,
Mark

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

[m***@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: ***@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

-------- ОрОгОМалМП пОсЌП --------
От: Mark Falk
ОтМПсМП: [jcifs] JCIFS WAN performance vs. Windows
ИзпратеМП Ма: Четвъртък, 2014, ДекеЌврО 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.
/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
http://i.imgur.com/Zl386qK.png
http://i.imgur.com/MIFcr39.png
Any thoughts? Packet details available upon request.
Thanks,
Mark