Tag Archives: kernel

Oracle 5 UEK VM interrupts gotcha

The good news is that the latest VMWare Player VMWare Tools (4.0.2 build-591240) now work with the Oracle Linux 5 UEK linux kernel but the bad news is that the ‘divider=’ kernel option seems to be ignored ┬áby the Oracle UEK kernel so you may need to switch back to the regular kernel if you wish to reduce the number of interrupts generated by all your Oracle Linux 5 vms !

heres an extract from my /boot/grub.conf

title Oracle Linux Server (2.6.32-300.21.1.el5uek)
 root (hd0,0)
 kernel /vmlinuz-2.6.32-300.21.1.el5uek ro root=LABEL=/ rhgb quiet divider=5 # IGNORED
 initrd /initrd-2.6.32-300.21.1.el5uek.img
title Oracle Linux Server (2.6.18-308.4.1.0.1.el5)
 root (hd0,0)
 kernel /vmlinuz-2.6.18-308.4.1.0.1.el5 ro root=LABEL=/ rhgb quiet divider=5 # NOT IGNORED
 initrd /initrd-2.6.18-308.4.1.0.1.el5.img
Advertisements

VMWare Server, hyper threading CPUs and the SMP kernel

Just noticed an interesting quirk with VMWare Server and hyper threading CPUs

I told my VM to use 1 CPU but CentOS 4 install detected the underlying hardware CPU had hyper threading so installed the SMP kernel !

Linux localhost.localdomain 2.6.9-67.0.15.ELsmp #1 SMP Thu May 8 10:52:19 EDT 2008 i686 i686 i386 GNU/Linux

as opposed to creating a VM where underlying hardware didn’t have hyper threading where CentOS 4 install just installed the basic kernel !

Linux localhost.localdomain 2.6.9-67.0.15.EL #1 Thu May 8 10:39:19 EDT 2008 i686 i686 i386 GNU/Linux