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Operating Systems Solaris ndd -set /dev/tcp tcp_host_param Post 302403477 by RTM on Friday 12th of March 2010 04:23:54 PM
Old 03-12-2010
Opened a case with SUN - this is their final answer...


Quote:
Unfortunately, with the T5240 system that you are using, scp will see slowness.
This write up applies to T5240 also.

Below is write up from our sustaining alias :
The T2000/T5240 requires multithreaded security apps to get super speeds. If
the application is single threaded, it will be up to 15 times slower over the
same application on a non-SUN4V. The ssh program is single threaded, so slowness
is normal.


The cause for the decreased performance on the T2000 is a combination of
factors. The scp and sftp routines are single threaded. When a single
threaded application is run in the multi-core cpu that is in the T1000
and T2000 it can perform less optimally than it would on the traditional
single threaded cpu in systems such as the V210, v240, v480. When a
single threaded routine such and the one for scp is run in the Niagara
cpu in the T2000 platform, it will not uses the 4 threads in the core and
as a result, perform less optimally. It does not utilize the full
resources of the core/cpu. The optimal performance on a T1000 or T2000
is when a multithreaded process is executed.

The transfer rate seen with scp (and sftp) in this situation is what
would and can be expected per my discussions with the ssh software
engineering group. To obtain a faster transfer rate when transferring
files to the T2000 the customer would want to use a method such as ftp
that transferred at a faster rate:

There would be no changes available to scp at this time.
 

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SCP(1)                                                      BSD General Commands Manual                                                     SCP(1)

NAME
scp -- secure copy (remote file copy program) SYNOPSIS
scp [-346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file] [-l limit] [-o ssh_option] [-P port] [-S program] [[user@]host1:]file1 ... [[user@]host2:]file2 DESCRIPTION
scp copies files between hosts on a network. It uses ssh(1) for data transfer, and uses the same authentication and provides the same secu- rity as ssh(1). scp will ask for passwords or passphrases if they are needed for authentication. File names may contain a user and host specification to indicate that the file is to be copied to/from that host. Local file names can be made explicit using absolute or relative pathnames to avoid scp treating file names containing ':' as host specifiers. Copies between two remote hosts are also permitted. The options are as follows: -3 Copies between two remote hosts are transferred through the local host. Without this option the data is copied directly between the two remote hosts. Note that this option disables the progress meter. -4 Forces scp to use IPv4 addresses only. -6 Forces scp to use IPv6 addresses only. -B Selects batch mode (prevents asking for passwords or passphrases). -C Compression enable. Passes the -C flag to ssh(1) to enable compression. -c cipher Selects the cipher to use for encrypting the data transfer. This option is directly passed to ssh(1). -F ssh_config Specifies an alternative per-user configuration file for ssh. This option is directly passed to ssh(1). -i identity_file Selects the file from which the identity (private key) for public key authentication is read. This option is directly passed to ssh(1). -l limit Limits the used bandwidth, specified in Kbit/s. -o ssh_option Can be used to pass options to ssh in the format used in ssh_config(5). This is useful for specifying options for which there is no separate scp command-line flag. For full details of the options listed below, and their possible values, see ssh_config(5). AddressFamily BatchMode BindAddress CanonicalDomains CanonicalizeFallbackLocal CanonicalizeHostname CanonicalizeMaxDots CanonicalizePermittedCNAMEs CertificateFile ChallengeResponseAuthentication CheckHostIP Ciphers Compression ConnectionAttempts ConnectTimeout ControlMaster ControlPath ControlPersist GlobalKnownHostsFile GSSAPIAuthentication GSSAPIDelegateCredentials HashKnownHosts Host HostbasedAuthentication HostbasedKeyTypes HostKeyAlgorithms HostKeyAlias HostName IdentitiesOnly IdentityAgent IdentityFile IPQoS KbdInteractiveAuthentication KbdInteractiveDevices KexAlgorithms LogLevel MACs NoHostAuthenticationForLocalhost NumberOfPasswordPrompts PasswordAuthentication PKCS11Provider Port PreferredAuthentications ProxyCommand ProxyJump PubkeyAcceptedKeyTypes PubkeyAuthentication RekeyLimit SendEnv ServerAliveInterval ServerAliveCountMax StrictHostKeyChecking TCPKeepAlive UpdateHostKeys UsePrivilegedPort User UserKnownHostsFile VerifyHostKeyDNS -P port Specifies the port to connect to on the remote host. Note that this option is written with a capital 'P', because -p is already reserved for preserving the times and modes of the file. -p Preserves modification times, access times, and modes from the original file. -q Quiet mode: disables the progress meter as well as warning and diagnostic messages from ssh(1). -r Recursively copy entire directories. Note that scp follows symbolic links encountered in the tree traversal. -S program Name of program to use for the encrypted connection. The program must understand ssh(1) options. -v Verbose mode. Causes scp and ssh(1) to print debugging messages about their progress. This is helpful in debugging connection, authentication, and configuration problems. EXIT STATUS
The scp utility exits 0 on success, and >0 if an error occurs. SEE ALSO
sftp(1), ssh(1), ssh-add(1), ssh-agent(1), ssh-keygen(1), ssh_config(5), sshd(8) HISTORY
scp is based on the rcp program in BSD source code from the Regents of the University of California. AUTHORS
Timo Rinne <tri@iki.fi> Tatu Ylonen <ylo@cs.hut.fi> BSD May 3, 2017 BSD
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