WARNING: The ixgbe driver compiles by default with the LRO

Posted: 5th May 2017 by admin in Linux How to
0
WARNING:  The ixgbe driver compiles by default with the LRO (Large Receive
Offload) feature enabled.  This option offers the lowest CPU utilization for
receives, but is completely incompatible with *routing/ip forwarding* and
*bridging*.  If enabling ip forwarding or bridging is a requirement, it is
necessary to disable LRO using compile time options as noted in the LRO
section later in this document.  The result of not disabling LRO when combined
with ip forwarding or bridging can be low throughput or even a kernel panic.

Red Hat Enterprise Linux “Use CAP_NET_ADMIN and alias netdev-bondX instead” Message on Boot

Posted: 5th May 2017 by admin in Linux How to
0

Red Hat Enterprise Linux  “Use CAP_NET_ADMIN and alias netdev-bondX instead” Message on Boot

Issue

Environment :

  • RHEL 6.2

  • kernel-2.6.32-220.el6

  • Bonding configuration

When load bonding driver in /etc/modprobe.d/bonding.conf on boot, the following message will be logged.

# cat /etc/modprobe.d/bonding.conf
alias bond0 bonding

kern: Loading kernel module for a network device with CAP_SYS_MODULE (deprecated).
Use CAP_NET_ADMIN and alias netdev-bond0 instead

Solution

dev_load() of kernel-2.6.32-220.el6 is the below.

void dev_load(struct net *net, const char *name)
{
…

no_module = !dev;
if (no_module && capable(CAP_NET_ADMIN))
no_module = request_module(“netdev-%s”, name);
if (no_module && capable(CAP_SYS_MODULE)) {
if (!request_module(“%s”, name))
pr_err(“Loading kernel module for a network device “
“with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s “
“instead\n”, name);
}
}

Root which run /etc/rc.d/rc.sysinit has both CAP_SYS_MODULE and CAP_NET_ADMIN capability. If not use netdev-xxx alias, above message will be logged.

Though this message can be ignored, if use netdev-xxx alias in /etc/modprobe.d/bonding.conf , it will not be logged.

# cat /etc/modprobe.d/bonding.conf
alias netdev-bond0 bonding

source : http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c03244209

how to compile gdbm 64 bit

Posted: 20th June 2011 by admin in Linux How to
0

how to compile gdbm 64 bit for solaris sparc 10

#CC=”gcc -m64″ CXX=”g++ -m64″ ./configure
#make
#make install

#file /usr/local/lib/libgdbm.so
/usr/local/lib/libgdbm.so: ELF 64-bit MSB dynamic lib SPARCV9 Version 1, dynamically linked, not stripped

Create ramdisk on solaris

Posted: 8th June 2011 by admin in Linux How to
0

Create ramdisk on solaris

#ramdiskadm -a idisk 512m

#newfs /dev/ramdisk/idisk

#mkdir /test

#mount /dev/ramdisk/idisk /test

how to change internet sharing ip on OSX

Posted: 8th May 2011 by admin in Linux How to
0

How to change Sharing network number to 10.10.0.0
# sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.nat NAT -dict-add SharingNetworkNumberStart 10.10.0.0

# defaults read /Library/Preferences/SystemConfiguration/com.apple.nat

restart internet sharing

edit open files limit on solaris

Posted: 29th August 2010 by admin in Linux How to
0

add 

# Hard limit
set rlim_fd_max = 65535

# Soft limit
set rlim_fd_cur = 65535

to /etc/system

/export/home to /home on solaris

Posted: 28th August 2010 by admin in Linux How to
0

/export/home to /home on solaris

add 

* -fstype=lofs :/export/home/&

to /etc/auto_home

install openldap (compile) on centos x86_64

Posted: 9th August 2010 by admin in Linux How to
0

install bdb

wget http://download.oracle.com/berkeley-db/db-4.8.30.tar.gz
tar -xvzf db-4.8.30.tar.gz
cd db-4.8.30/build_unix/
../dist/configure --prefix=/usr/local
make
make install

install openldap

wget ftp://ftp.OpenLDAP.org/pub/OpenLDAP/openldap-stable/openldap-stable-20100719.tgz
tar -xvzf openldap-stable-20100719.tgz
cd openldap-*
./configure
make depend
make 
make install

soelim: command not found on centos x86_64

Posted: 9th August 2010 by admin in Linux How to
0
yum install groff.x86_64

install python 2.7 , gevent on centos 5 x86_64

Posted: 4th August 2010 by admin in Linux How to
0
# yum install gcc gcc-c++.x86_64 compat-gcc-34-c++.x86_64 openssl-devel.x86_64 zlib*.x86_64

install python 2.7

# wget http://www.python.org/ftp/python/2.7/Python-2.7.tar.bz2
# tar -xvjf Python-2.7.tar.bz2
# cd Python*
# ./configure --prefix=/opt/python27
# make
# make install
# vi ~/.bash_profile

replace PATH=$PATH:$HOME/bin
with PATH=$PATH:$HOME/bin:/opt/python27/bin

reload .bash_profile

# source ~/.bash_profile
# echo "/opt/python27/lib" > /etc/ld.so.conf.d/python27.conf
# ldconfig

install setuptool

# cd ~
# wget http://pypi.python.org/packages/2.7/s/setuptools/setuptools-0.6c11-py2.7.egg
# sh setuptools-0.6c11-py2.7.egg

install gevent

# yum install libevent.x86_64 libevent-devel.x86_64
# easy_install-2.7 greenlet
# wget http://pypi.python.org/packages/source/g/gevent/gevent-0.13.0.tar.gz
# tar -xvzf gevent-0.13.0.tar.gz
# cd gevent*
# python2.7 setup.py install
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