FWN/Beats/Virtualization: Difference between revisions

Latest revision as of 18:09, 18 December 2009

Virtualization

In this section, we cover discussion of Fedora virtualization technologies on the @fedora-virt list.

Contributing Writer: Dale Bewley

Fedora Virtualization List

This section contains the discussion happening on the fedora-virt list.

Virt Status Report

Justin Forbes posted^[1] a Fedora virtualization status report. Justin pointed out F13 bugs^[2] now include Important and Pony classifications in addition to Blocker and Target.

↑ http://www.redhat.com/archives/fedora-virt/2009-December/msg00056.html
↑ http://fedoraproject.org/wiki/Virtualization_bugs

RHEL and Fedora Virtualization Feature Parity

Robert Day wondered how the virtualization features^[1] of Red Hat Enterprise Linux 5.4 compared to Fedora 12.

Daniel Berrange explained^[2] "The KVM based virtualization in RHEL-5.4 is not nearly so far behind Fedora as you might think. The libvirt mgmt stack in RHEL-5.4 was rebased to be near parity with Fedora 11, and KVM in RHEL-5.4 is also pretty close to that using what's best described as a hybrid of kvm-83 and kvm-84."

↑ http://www.redhat.com/virtualization/rhev/
↑ http://www.redhat.com/archives/fedora-virt/2009-December/msg00040.html

@@ Line 1: / Line 1: @@
 [[Category:Virtualization]] <!-- do not copy into FWN issue -->
+{{Anchor|Virtualization}}
-{{Anchor|Virtualization}}
 == Virtualization ==
 In this section, we cover discussion of Fedora virtualization technologies on the
-@fedora-virt and @virt-tools lists..
+@fedora-virt list.
 Contributing Writer: [[User:Dale | Dale Bewley]]
@@ Line 14: / Line 14: @@
 [http://www.redhat.com/mailman/listinfo/fedora-virt fedora-virt list].
-==== KSM Tuning ====
+==== Virt Status Report ====
-[[IzikEidus|Izik Eidus]]
-<ref>http://www.redhat.com/archives/fedora-virt/2009-October/msg00110.html</ref>
-" by default enabled and only with 2000 kernel pages... What I am worried about is that users wont use the ksm tunning script and would just run ksm with this 2000 kernel pages - the result would be that ksm will probably merge just the zero pages (that could be alot of memory) and the user might not know
-that much more memory can be saved...
-Is it possible to at least make ksm disabled by default? so the users will have to run the ksm tunning script when they want to start ksm?
-And if we set it to disabled by default, cant we set the initialized values
-into more realistic value? (like 1/4 of the memory in the mainline kernels? )
-"
-[[MarkMcLoughlin|Mark McLoughlin]]
-<ref>http://www.redhat.com/archives/fedora-virt/2009-October/msg00112.html</ref>
-"ksm is disabled by default currently"
-"Here's the logic we have in the init script<ref>http://gitorious.org/ksm-control-scripts/ksm-control-scripts</ref>:
-<pre>
-  # unless KSM_MAX_KERNEL_PAGES is set, let ksm munch up to half of total memory.
-  default_max_kernel_pages () {
-      local total pagesize
-      total=`awk '/^MemTotal:/ {print $2}' /proc/meminfo`
-      pagesize=`getconf PAGESIZE`
-      echo $[total * 1024 / pagesize / 2]
-  }
-</pre>
 [[JustinForbes|Justin Forbes]]
-<ref>http://www.redhat.com/archives/fedora-virt/2009-October/msg00115.html</ref>
+posted<ref>http://www.redhat.com/archives/fedora-virt/2009-December/msg00056.html</ref> a Fedora virtualization status report.
+Justin pointed out F13 bugs<ref>http://fedoraproject.org/wiki/Virtualization_bugs</ref> now include Important and Pony classifications in addition to Blocker and Target.
-"There are actually 2 init scripts.  One to turn on ksm, and one for tuning.
+<references />
-The actual ksm init script simply makes sure ksm is turned on in the kernel
-and sets max_kernel_pages to half of system memory.  The ksmtuned script is
-a bit more involved."
-[[MarkMcLoughlin|Mark McLoughlin]]
+==== RHEL and Fedora Virtualization Feature Parity ====
-<ref>http://www.redhat.com/archives/fedora-virt/2009-October/msg00119.html</ref>
+Robert Day wondered how the virtualization features<ref>http://www.redhat.com/virtualization/rhev/</ref> of Red Hat Enterprise Linux 5.4
-"For Fedora 13, it'll be off by default in the kernel and the recommended
+compared to Fedora 12.
-way of switching it on is with 'chkconfig ksm on'
-For Fedora 12, it's on by default in the kernel, 'chkconfig ksm on' just
+[[DanielBerrange|Daniel Berrange]]
-changes max pages and the only way of disabling it is by manually
+explained<ref>http://www.redhat.com/archives/fedora-virt/2009-December/msg00040.html</ref>
-writing zero to {{filename|/sys/kernel/mm/ksm/run}}"
+"The KVM based virtualization in RHEL-5.4 is not nearly so far behind
+Fedora as you might think. The {{package|libvirt}} mgmt stack in RHEL-5.4 was
+rebased to be near parity with [[Releases/11|Fedora 11]], and KVM in RHEL-5.4 is
+also pretty close to that using what's best described as a hybrid of
+kvm-83 and kvm-84."
-"We'll probably end up with this behaviour in F12 updates at some point
+<references />
-anyway when 2.6.32 is pulled in"
-[[JustinForbes|Justin Forbes]]
-"The limit to half of total memory is because ksm pages are unswappable at
-this time.  To be fixed in a future kernel."
+====  ====
 <references />
-=== Virtualization Tools List ===
+====  ====
-This section contains the discussion happening on the
-[http://www.redhat.com/mailman/listinfo/virt-tools-list virt-tools-list list].
-==== libosinfo Revisited ====
-[[ArjunRoy|Arjun Roy]]
-revived<ref>http://www.redhat.com/archives/virt-tools-list/2009-October/msg00091.html</ref>
-discussion of a library to track details of OS distributions for use by tools
-such as {{package|python-virtinst}} and <code>virt-inspector</code>. LibOSinfo was first proposed<ref>http://fedoraproject.org/wiki/FWN/Issue180#libosinfo:_Library_for_Virt_OS.2Fdistro_Metadata</ref>
-by [[ColeRobinson|Cole Robinson]].
 <references />

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