Red Hat LINUX VIRTUAL SERVER 4.7 - ADMINISTRATION Specifications download pdf (Page 14)

Installing and Configuring Linux Guest Operating Systems

Recommended Configurations

BasedonvendorsupportintheirLinuxkernels,weexpectthefollowingconfigurationstohavethebest

timekeepingbehaviorinaLinuxvirtualmachine:

 SUSELinuxEnterpriseServer10SP232‐bitor64‐bitrunningonESX3.5Update2orlater

 Ubuntu8.0432‐bitrunningonESX3.5Update2orlater

AmongRedHatEnterpriseLinux4and5,versionswiththedivider=10optionhavebettertimekeeping

behaviorthanthosewithout.

FormoreinformationonVMI‐enabledkernels,seethefollowingVMwareknowledgebasearticles:

 “HowtoenableavirtualmachineinterfaceinaLinuxkernelandinESXServer3.5”

 “EnablingVMIwithSLES10SP232bitvirtualmachinesonESX”

Forlinks,see“Resources”onpage 19.

NTP Recommendations

Wheneverpossible,useNTPinsteadofVMwareToolsperiodictimesynchronization.Also,youmayneedto

openthefirewall(UPD123)toallowNTPtraffic.

ToenableNTP,youmustmodify/etc/ntp.conf.Thefollowingisasample/etc/ntp.conf:

tinker panic 0

restrict 127.0.0.1

restrict default kod nomodify notrap

server 0.vmware.pool.ntp.org

server 1.vmware.pool.ntp.org

server 2.vmware.pool.ntp.org

driftfile /var/lib/ntp/drift

Thefollowingisasample/etc/ntp/step-tickers:

0.vmware.pool.ntp.org

1.vmware.pool.ntp.org

RedHatEnterpriseLinux3(allupdates) Hasnoworkaroundforlosttick

overcompensation.Avoidusingifpossible.

SUSELinuxEnterpriseServer10SP2onESX

3.5andlater

Recommended.

SUSELinuxEnterpriseServer10SP2onESX

Server3.0.xandearlier

notsc

SUSELinuxEnterpriseServer10SP1 notsc

SUSELinuxEnterpriseServer

10 notsc

SUSELinuxEnterpriseServer9withkernel

version2.6.5‐7.312orlater

ignore_lost_ticks

SUSELinuxEnterpriseServer9withkernel

version2.6.5‐7.311orearlier

Hasnoworkaroundforlosttick

overcompensation.Avoidusingifpossible.

Ubuntu7.10,8.04 clocksource=acpi_pm

Ubuntu5.10,6.06,6.10,7.04 notsc

Ubuntu5.04 Doesnotsupportnotsc.Avoidusing

if

possible.

Table 5. Settings for 64-bit Kernels

Linux Version Kernel Parameters Notes

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 22 23

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Red Hat LINUX VIRTUAL SERVER 4.7 - ADMINISTRATION Specifications Page 14

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