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Full Discussion: Network becomes slow and return fast only after restart network
Operating Systems Linux Red Hat Network becomes slow and return fast only after restart network Post 302895303 by moshesa on Monday 31st of March 2014 05:59:38 AM
Old 03-31-2014
Network becomes slow and return fast only after restart network
Hi,
I have 2 machines in production environment:
1. redhat machine for application
2. DB machine (oracle)

The application doing a lot of small read&writes from and to the DB machine.

The problem is that after some few hours the network from the application to the DB becomes very slow and it returns to the normal only after:
Code:
service network restart

Before:
Code:
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=1 ttl=63 time=7.81 ms
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=2 ttl=63 time=5.88 ms
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=3 ttl=63 time=7.81 ms

After restart network:
Code:
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=84 ttl=63 time=0.135 ms
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=85 ttl=63 time=0.171 ms
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=86 ttl=63 time=0.153 ms

What can it be?
How can i solve this strange behavior?

Thanks.
 

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LEARN ABOUT REDHAT

rhnsd

UP2DATE(8)							   Red Hat, Inc.							UP2DATE(8)

NAME

       rhnsd - a program for quering the Red Hat Network for updates and information

SYNOPSIS

       rhnsd [OPTION]...

DESCRIPTION

       rhnsd  is  a  daemon  process that runs in the background and periodically polls the Red Hat Network to see if there are any queued actions
       available. If any are queued, it runs them.

       rhnsd is typically started from the init scripts in /etc/init.d/rhnsd when it's time to poll the Red  Hat  Network  servers  for  available
       updates and actions. The default interval is every 120 minutes.	The minimum polling interval is 60 minutes.

       To  check for updates, rhnsd runs an external program called rhn_check. This is a small application that actually makes the network connec-
       tion to Red Hat Networks.

       The rhnsd daemon does not listen on any network ports, nor does it ever talk to the network directly. Any network activity is done via  the
       rhn_check utility.

       rhnsd  can  be configure by editing the /etc/sysconfig/rhn/rhnsd config file. This is actually the configuration file the rhnsd init script
       /etc/init.d/rhnsd uses.

       -i, --interval
	      Specify the interval that rhnsd should wait between checking the Red Hat Network. Default is 120 minutes, the minimum is 60 minutes.
	      This can also be specified in /etc/sysconfig/rhn/rhnsd

       -v, --verbose
	      output more information about what rhnsd is doing.

       -f, --foreground
	      force the rhnds process to run in the foreground instead of automatically backgrounding itself, as it does by default.

       FILES
       /etc/sysconfig/rhn/rhnsd
	      Configuration settings for the rhnsd daemons init script.
       /usr/sbin/rhn_check
	      The external program launched by rhnsd to connect to the Red Hat Network and retrieve any actions that have queued up.
       /etc/sysconfig/rhn/systemid
	      A certification that authenticates the client machine to the Red Hat Network. Generated via the up2date or rhnreg_ks utility.

SEE ALSO

       The rhnsd daemon is tightly coupled with Red Hat Network.  Visit <http://www.redhat.com/network> for access or to sign up.

       rhn_check(8), up2date(8), up2date-config(8),

AUTHORS

       Written by Preston Brown <pbrown@redhat.com> and
       Cristian Gafton <gafton@redhat.com>
REPORTING BUGS

       Report bugs to <http://bugzilla.redhat.com>.
COPYRIGHT

       Copyright (C) 1999, 2000 Red Hat, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

4th Berkeley Distribution					  Fri Feb 9 2001							UP2DATE(8)
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