Some possibilities of why the STAF ping performance is slower between your
Windows and Linux systems are:
1) Network issues
2) TCP/IP configuration / tuning issues
3) Problem resolving host names - Even though you are submitting a STAF
PING request specifying a IP address, STAF migth still try to resolve
hostnames (e.g. to better support dynamic IPs, etc).
Here's more information on each of these possibilities:
1) Network issues:
You can use a network sniffer, etc. to debug network issues.
Is the response time for a regular (non-STAF) ping long as well? If so,
then it is not an issue specific to STAF.
Otherwise, if you do a non-ping, non-STAF, remote connection between the
systems, do you get the same 4+ second response. For example, from your
Windows system, start a ssh/telnet session to the Linux system. Does the
ssh/telnet request respond immediately or take 4+ seconds before
displaying the userid prompt? If it takes 4+ seconds, then the delay
probably has something to do with the network configuration and is not an
issue specific to STAF.
2) TCP/IP configuration / tuning issues:
Slow performance can be caused by the Windows Firewall. For example, some
people using VMware have turned off the frewall for the vmnet1 & vmnet8
interfaces to increase performance.
If NETBIOS over TCP/IP is configured on your Windows system, perhaps a
gethostbyname() may be trying to do a WINS resolution which could slow
things down. If so, you could try disabling the WINS name resolution on
your Windows system to see if that improves things.
There is some TCP/IP tuning that you can do on Windows to increase network
performance. For example, you can adjust the setting for "DTCPIP ACK" via
a Windows registry key. For more information on "Delayed TCPIP ACK can
cause slow network throughput", see
http://smallvoid.com/article/winnt-nagle-algorithm.html . This link also
references other TCP tuning you can do on Windows. Also, see
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q321098 as it
talks about setting the TcpDelAckTicks registry value to zero on your
Windows systems to alleviates the performance issues. Note, you may need
to reboot the Windows system for the change to take place. Also, see
forum posting "STAF: Performance Issues" at
http://sourceforge.net/projects/staf/forums/forum/104045/topic/2156472 for
information like this.
3) Problem resolving host names:
See section "3.1.15 Why is the performance slow when sending a STAF PING
request to a remote machine?" in the STAF FAQ at
http://staf.sourceforge.net/current/STAFFAQ.htm#Slow performance sending a
STAF PING request to a remote machine. It says:
If submitting a STAF PING request to the PING service on a remote machine
is slow (e.g. > 5 seconds), and it is not because the network is slow, a
hostname resolution issue may be causing the performance issue. To debug
this, enable the STAF warning and error tracepoints on both machines and
redirect the STAFProc trace output to a file by running the following
commands on each machine (specifying a file name of your choice):
STAF local TRACE ENABLE TRACEPOINTS "warning error"
STAF local TRACE SET DESTINATION TO FILE "/tmp/STAFProc.trc"
Then, submit the STAF PING request to the PING service on the remote
machine again and check if there are any errors or warnings logged in the
STAF trace files on each machine.
If you see a trace warning message like the following:
Error getting hostname (for IP address 99.99.999.99,
STAFSocketGetNameByInAddr(), RC: 0,
Info: Error getting hostent structure: gethostbyaddr_r() host_error=2
after retrying 20 times
there is a problem resolving the host name. You may be able to resolve the
issue by adding a hostname entry to the hosts network hostname file (e.g.
/etc/hosts) which keeps track of the mapping between host names and IP
addresses.
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com
(512) 286-7313 or Tieline 363-7313
From: Luca Robusto <lucarobu...@gmail.com>
To: STAF-USERS-REQUESTS <staf-users@lists.sourceforge.net>,
Date: 03/26/2013 10:59 AM
Subject: [staf-users] issue performance
Hi Lucas,
I am using STAF both on Windows (Windows 2008 Server RC2 SP1 64 bit) and
Linux (Red Hat 5.7 Server 64bit).
I have performance issue when a STAF request is sent from a Windows
machine to a Linux machine, or from a Linux machine to a Windows machine.
I have very quick response (some milliseconds) when the request is done on
the same OS; the same kind of request takes very long time (some seconds)
if done through Windows to Linux, or Linux to Windows.
An example is provided here:
Windows to Windows
>STAFLoop 10 10.xx.xx.xx ping ping
Total loops: 10
Total time : 6.349
Avg. time : 0.634
Loops/sec : 1.57505
Windows to Linux
>STAFLoop 10 10.xx.xx.xx ping ping
Total loops: 10
Total time : 46.238
Avg. time : 4.623
Loops/sec : 0.216272
Linux to Windows
$STAFLoop 10 10.xx.xx.xx ping ping
Total loops: 10
Total time : 0.996
Avg. time : 0.099
Loops/sec : 10.0402
Linux to Windows
$ STAFLoop 10 10.xx.xx.xx ping ping
Total loops: 10
Total time : 48.268
Avg. time : 4.826
Loops/sec : 0.207177
Why request through heterogeneous operative systems are so slowly? Where
is, in your opinion, the bottleneck during the request?
I did all the tests suggested on the FAQ.
Many thanks and best regards,
Luca Robusto
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