Slow sftp transfer speed vs ftp

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Date: Thu, 17 Feb 2005 10:36:39 -0500
To: "Mailing List - SunManagers (E-mail)" <sunmanagers@sunmanagers.org>

I have 2 new Sun boxes (SunFire 440 & SunFire 240) installed with latest
Solaris 9 + cluster.

Both servers interface are set to 100 mbps full duplex.

When I am transfering data between the servers with sftp (SunSSH builtin
with Solaris 9) I am transfering at 300 kb/sec.
When I am transfering data between the serveur with ftp (inetd) I am
transfering at 8000 kb/sec.

When transfering data with SFTP, the CPU utilization is not greater than 10%
on both client and server.

What can explain the difference of data speed rate ?

This is my /etc/ssh/sshd_config

[user@host]-[~]$ cat /etc/ssh/sshd_config
# Copyright (c) 2001 by Sun Microsystems, Inc.
# All rights reserved.
#
# ident "@(#)sshd_config 1.3 01/10/08 SMI"
#
# Configuration file for sshd(1m)

# Protocol versions supported
#
# The sshd shipped in this release of Solaris has support for major versions
# 1 and 2. It is recommended due to security weaknesses in the v1 protocol
# that sites run only v2 if possible. Support for v1 is provided to help
sites
# with existing ssh v1 clients/servers to transition.
# Support for v1 may not be available in a future release of Solaris.
#
# To enable support for v1 an RSA1 key must be created with ssh-keygen(1).
# RSA and DSA keys for protocol v2 are created by /etc/init.d/sshd if they
# do not already exist, RSA1 keys for protocol v1 are not automatically
created.

# Uncomment ONLY ONE of the following Protocol statements.

# Only v2 (recommended)
Protocol 2

# Both v1 and v2 (not recommended)
#Protocol 2,1

# Only v1 (not recommended)
#Protocol 1

# Listen port (the IANA registered port number for ssh is 22)
Port 22

# The default listen address is all interfaces, this may need to be changed
# if you wish to restrict the interfaces sshd listens on for a multi homed
host.
# Multiple ListenAddress entries are allowed.

# IPv4 only
ListenAddress 0.0.0.0
# IPv4 & IPv6
#ListenAddress ::

# Port forwarding
AllowTcpForwarding yes

# If port forwarding is enabled, specify if the server can bind to
INADDR_ANY.
# This allows the local port forwarding to work when connections are
received
# from any remote host.
GatewayPorts no

# X11 tunneling options
X11Forwarding yes
X11DisplayOffset 10

# The maximum number of concurrent unauthenticated connections to sshd.
# start:rate:full see sshd(1) for more information.
# The default is 10 unauthenticated clients.
#MaxStartups 10:30:60

# Banner to be printed before authentication starts.
Banner /etc/issue

# Should sshd print the /etc/motd file and check for mail.
# On Solaris it is assumed that the login shell will do these (eg
/etc/profile).
PrintMotd no
CheckMail no

# KeepAlive specifies whether keep alive messages are sent to the client.
# See sshd(1) for detailed description of what this means.
# Note that the client may also be sending keep alive messages to the
server.
KeepAlive yes

# Syslog facility and level
SyslogFacility auth
LogLevel info

#
# Authentication configuration
#

# Host private key files
# Must be on a local disk and readable only by the root user (root:sys 600).
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key

# Default Encryption algorithms and Message Authentication codes
Ciphers aes128-cbc,blowfish-cbc,3des-cbc
MACS hmac-sha1,hmac-md5

# Length of the server key
# Default 768, Minimum 512
ServerKeyBits 768

# sshd regenerates the key every KeyRegenerationInterval seconds.
# The key is never stored anywhere except the memory of sshd.
# The default is 1 hour (3600 seconds).
KeyRegenerationInterval 3600

# Ensure secure permissions on users .ssh directory.
StrictModes yes

# Length of time in seconds before a client that hasn't completed
# authentication is disconnected.
# Default is 600 seconds. 0 means no time limit.
LoginGraceTime 600

# Maximum number of retries for authentication
# Default is 6. Default (if unset) for MaxAuthTriesLog is MaxAuthTries / 2
MaxAuthTries 6
MaxAuthTriesLog 3

# Are logins to accounts with empty passwords allowed.
# If PermitEmptyPasswords is no, pass PAM_DISALLOW_NULL_AUTHTOK
# to pam_authenticate(3PAM).
PermitEmptyPasswords no

# To disable tunneled clear text passwords, change PasswordAuthentication to
no.
PasswordAuthentication yes

# Use PAM via keyboard interactive method for authentication.
# Depending on the setup of pam.conf(4) this may allow tunneled clear text
# passwords even when PasswordAuthentication is set to no. This is dependent
# on what the individual modules request and is out of the control of sshd
# or the protocol.
PAMAuthenticationViaKBDInt yes

# Are root logins permitted using sshd.
# Note that sshd uses pam_authenticate(3PAM) so the root (or any other) user
# maybe denied access by a PAM module regardless of this setting.
# Valid options are yes, without-password, no.
PermitRootLogin no

# sftp subsystem
Subsystem sftp /usr/lib/ssh/sftp-server

# SSH protocol v1 specific options
#
# The following options only apply to the v1 protocol and provide
# some form of backwards compatibility with the very weak security
# of /usr/bin/rsh. Their use is not recommended and the functionality
# will be removed when support for v1 protocol is removed.

# Should sshd use .rhosts and .shosts for password less authentication.
IgnoreRhosts yes
RhostsAuthentication no

# Rhosts RSA Authentication
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts.
# If the user on the client side is not root then this won't work on
# Solaris since /usr/bin/ssh is not installed setuid.
RhostsRSAAuthentication no

# Uncomment if you don't trust ~/.ssh/known_hosts for
RhostsRSAAuthentication.
#IgnoreUserKnownHosts yes

# Is pure RSA authentication allowed.
# Default is yes
RSAAuthentication yes
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