Solaris sftp throttling?

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Operating Systems Solaris Solaris sftp throttling?
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Old 09-27-2011
Solaris sftp throttling?

I get poor performance when sftp'ing a file to a server on a SunOS 5.10 system, with Sun_SSH_1.1.4. The same client performs much better to a linux system at the same site.

From a TCPdump, it appears that the Solaris server is throttling the thruput. After proceeding normally for a while, the server sends a duplicate ack, then a return data packet. This data packet seems to cause my client to stop sending.

After the server receives the ack for that reverse data packet, the server acks all outstanding packets, and sends another data packet. On receipt of that second data packet, my client resumes sending.

This process is repeated regularly, resulting in poor performance.

Any clues on what is going on, or how to speed this up?
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sftp-server(1M) 					  System Administration Commands					   sftp-server(1M)

sftp-server - SFTP server subsystem SYNOPSIS
/usr/lib/ssh/sftp-server DESCRIPTION
sftp-server implements the server side of the SSH File Transfer Protocol as defined in the IETF draft-ietf-secsh-filexfer. sftp-server is a subsystem for sshd(1M) and must not be run directly. There are no options or config settings. To enable the sftp-server subsystem for sshd add the following to /etc/ssh/sshd_config: Subsystem sftp /usr/lib/ssh/sftp-server See sshd_config(4) for a description of the format and contents of that file. There is no relationship between the protocol used by sftp-server and the FTP protocol (RFC 959) provided by in.ftpd. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. FILES
/usr/lib/sftp-server ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWsshdu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
sftp(1), ssh(1), ssh-add(1), ssh-keygen(1), sshd(1M), sshd_config(4), attributes(5) To view license terms, attribution, and copyright for OpenSSH, the default path is /var/sadm/pkg/SUNWsshdr/install/copyright. If the Solaris operating environment has been installed anywhere other than the default, modify the given path to access the file at the installed location. AUTHOR
Markus Friedl SunOS 5.10 30 Jul 2003 sftp-server(1M)