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eede884554
The XML we use is:
<clock offset="utc">
<timer name="rtc" tickpolicy="catchup"/>
<timer name="pit" tickpolicy="delay"/>
<timer name="hpet" present="no"/>
</clock>
Which translates to the qemu commands:
-no-hpet -no-kvm-pit-reinjection -rtc driftfix=slew
The latter two bits are already used by openstack and gnome boxes by
default.
On RHEL hpet is compiled out so -no-hpet is the default,
but not everywhere else. Though recently the RH guys confirmed that
for regular usage it should be turned off because a) qemu support
is not that good, b) most users don't need it anyways c) it has
a performance penalty.
This default can be overridden from a virt-install command like
--clock rtc_tickpolicy=delay
When Guest() sees that a timer has already been defined, it won't
set the new defaults, and that setting above is the old implied
default rtc setting.
48 lines
1.3 KiB
XML
48 lines
1.3 KiB
XML
<domain type="xen">
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<name>TestGuest</name>
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<uuid>12345678-1234-1234-1234-123456789012</uuid>
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<memory>409600</memory>
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<currentMemory>204800</currentMemory>
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<vcpu>5</vcpu>
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<os>
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<type arch="i686">hvm</type>
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<loader>/usr/lib/xen/boot/hvmloader</loader>
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<boot dev="cdrom"/>
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<boot dev="hd"/>
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</os>
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<features>
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<acpi/>
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<apic/>
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</features>
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<clock offset="utc">
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<timer name="rtc" tickpolicy="catchup"/>
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<timer name="pit" tickpolicy="delay"/>
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<timer name="hpet" present="no"/>
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</clock>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>destroy</on_reboot>
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<on_crash>destroy</on_crash>
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<devices>
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<emulator>/usr/lib/xen/bin/qemu-dm</emulator>
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<disk type="file" device="disk">
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<driver name="qemu" type="raw"/>
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<source file="/tmp/test.img"/>
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<target dev="hda" bus="ide"/>
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</disk>
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<disk type="block" device="disk">
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<driver name="qemu" type="raw" cache="none" io="native"/>
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<source dev="/iscsi-pool/diskvol1"/>
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<target dev="hdb" bus="ide"/>
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</disk>
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<disk type="file" device="cdrom">
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<driver name="qemu"/>
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<source file="/dev/null"/>
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<target dev="hdc" bus="ide"/>
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<readonly/>
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</disk>
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<input type="mouse" bus="ps2"/>
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<graphics type="sdl" display=":3.4" xauth="/tmp/.Xauthority"/>
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<console type="pty"/>
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</devices>
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</domain>
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