Mailing List Archive: [Bug 1014] SCP slow bandwidth with Solaris8 on n240

http://bugzilla.mindrot.org/show_bug.cgi?id=1014

Summary: SCP slow bandwidth with Solaris8 on n240
Product: Portable OpenSSH
Version: 3.7.1p2
Platform: ix86
OS/Version: SunOS
Status: NEW
Severity: normal
Priority: P2
Component: scp
AssignedTo: openssh-bugs@mindrot.org
ReportedBy: banville_c@hotmail.com

Hi,

I'm experiencing some bandwidth issue when using SCP on SunOS and using SUN
hardware platform n240. These n240 server are using SUN IPMP feature. The SCP
bandwidth issue is seen when files are transfered between two n240 servers
using the active IP Interface (bge0). When the inactive IP Interface (bge1) is
used to execute the transfer, no bandwidth issue is seen. Bandwidth issue is
only seen when SCP "get" is executed. "Pushing" a file using SCP do not causing
any bandwidth issue in any way.

Here is a summay of the issue:
- SCP "push" - No Bandwidth issue - Transfer rate = 10MB/s
- SCP "get" - Inactive IP Interface - No Bandwidth issue => 10 MB/s
- SCP "get" - Active IP Interface - Bandwidth issue => ~1.0MB/s - 500 kB/s

Testing was accomplish using SFTP and FTP. No Bandwidth issue seen.
Testing was also accomplish using SCP -1....No Bandwidth issue seen.

Versions of OpenSSH used for testing: 3.7.1p2 and 4.0p1
Problem seen with both OpenSSH version.

Below are more detail regarding the transfer issue.
Any ideas, comments or solutions would be appreciated.
Thanks,
Chris

======================================================================
N240/SunOS Version where issue was reproduced.
======================================================================

SunOS version:
SunOS 5.8 Generic 108528-29 Jan 2004
OR
SunOS TLWIPC01 5.8 Generic_117350-13 sun4u sparc SUNW,Netra-240

ssh -V
OpenSSH_3.7.1p2-pwexp24, SSH protocols 1.5/2.0, OpenSSL 0.9.7c 30 Sep 2003
OR
OpenSSH_4.0p1, OpenSSL 0.9.7f 22 Mar 2005

======================================================================
Test Executed
======================================================================
We created a 50MB file on a webserver.

n240-A> mkfile 50m /tmp/testfile
n240-A> chmod u+w /tmp/testfile

We send it to n240-B like this
n240-A> scp /tmp/testfile sysadmin@n240-B:/tmp

We retrieve the file like this
n240-A> scp sysadmin@n240-B:/tmp/testfile /tmp

======================================================================
File Transfer results.
======================================================================

[SERVER1]/tmp:=> ifconfig -a
lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
bge0: flags=9040843<UP,BROADCAST,RUNNING,MULTICAST,DEPRECATED,IPv4,NOFAILOVER>
mtu 1500 index 2
inet 47.135.87.18 netmask ffffffe0 broadcast 47.135.87.31
groupname imspub
bge0:1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 47.135.87.20 netmask ffffffe0 broadcast 47.135.87.31
bge1:
flags=69040843<UP,BROADCAST,RUNNING,MULTICAST,DEPRECATED,IPv4,NOFAILOVER,STANDBY
,INACTIVE> mtu 1500 index 3
inet 47.135.87.19 netmask ffffffe0 broadcast 47.135.87.31
groupname imspub

Active IP Interface (bge0):

[SERVER0]/tmp:=> scp nortel@47.135.87.18:/tmp/testfile /tmp/testfile
The authenticity of host '47.135.87.18 (47.135.87.18)' can't be established.
RSA key fingerprint is 39:2d:49:3c:96:16:7f:6c:00:c1:e5:2b:6f:7b:14:ea.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '47.135.87.18' (RSA) to the list of known hosts.
nortel@47.135.87.18's password:
testfile 100% 50MB 774.2KB/s 01:01
[SERVER0]/tmp:=> scp /tmp/testfile nortel@47.135.87.18:/tmp/testfile
nortel@47.135.87.18's password:
testfile 100% 50MB 10.2MB/s 00:04

[SERVER0]/tmp:=> ftp 47.135.87.18
ftp> get testfile
52428800 bytes received in 4.5 seconds (11379.72 Kbytes/s)
ftp> put testfile
52428800 bytes sent in 4.5 seconds (11295.58 Kbytes/s)

Inactive IP Interface (bge1):

[SERVER0]/tmp:=> scp nortel@47.135.87.19:/tmp/testfile /tmp/testfile
The authenticity of host '47.135.87.19 (47.135.87.19)' can't be established.
RSA key fingerprint is 39:2d:49:3c:96:16:7f:6c:00:c1:e5:2b:6f:7b:14:ea.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '47.135.87.19' (RSA) to the list of known hosts.
nortel@47.135.87.19's password:
testfile 100% 50MB 10.1MB/s 00:04
[SERVER0]/tmp:=> scp /tmp/testfile nortel@47.135.87.19:/tmp/testfile
nortel@47.135.87.19's password:
testfile 100% 50MB 10.1MB/s 00:05

[SERVER0]/tmp:=> ftp 47.135.87.19
ftp> get testfile
52428800 bytes received in 4.5 seconds (11296.81 Kbytes/s)
ftp> put testfile
52428800 bytes sent in 4.6 seconds (11251.99 Kbytes/s)

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http://bugzilla.mindrot.org/show_bug.cgi?id=1014

banville_c@hotmail.com changed:

What |Removed |Added
----------------------------------------------------------------------------
Summary|SCP slow bandwidth with |SCP slow bandwidth with
|Solaris8 on n240 |Solaris8 on n240

------- Additional Comments From banville_c@hotmail.com 2005-04-21 00:07 -------
I'm trying to test your solution but I'm having all sort of issues.

The Solaris 8 we currently use doesn't contain any development tools/packages
what so ever. I'm trying to compile the OpenSSH code (with your patch) but
it's not working too good. I had to install gcc and a lot of development/tools
packages and also modify a few of my OS settings in order for the ./configure
to work. I have that working properly now but the "make" and "make install"
don't seem to be executing properly. I'm working on it.

In order to install OpenSSH and OpenSSL recent version, I downloaded pre-
builded Solaris8 packages. Would it be possible to build one with the code
changes suggested?

Thanks,
Chris

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