openstack/nova-specs
Code Issues Proposed changes

Fix misspellings of "scheduler"

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We had several examples of "schedular", which this patch corrects.

Change-Id: I0f0ae9635796ae3fd3680b4376eacdc6a2a2e043
This commit is contained in:
Dan Smith 2015-10-02 08:47:09 -07:00
parent 6fcf199481
commit d39bcd8781
3 changed files with 10 additions and 10 deletions
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8
specs/juno/approved/virt-driver-cpu-pinning.rst
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@ -71,7 +71,7 @@ This will only be honoured if the flavor does not already have a threads
policy set. This ensures the cloud administrator can have absolute control
over threads policy if desired.
The schedular will have to be enhanced so that it considers the usage of CPUs
The scheduler will have to be enhanced so that it considers the usage of CPUs
by existing guests. Use of a dedicated CPU policy will have to be accompanied
by the setup of aggregates to split the hosts into two groups, one allowing
overcommit of shared pCPUs and the other only allowing dedicated CPU guests.
@ -147,7 +147,7 @@ that their guest should have more predictable CPU execution latency.
Performance Impact
------------------
The schedular will incur small further overhead if a threads policy is set
The scheduler will incur small further overhead if a threads policy is set
on the image or flavor. This overhead will be negligible compared to that
implied by the enhancements to support NUMA policy and huge pages. It is
anticipated that dedicated CPU guests will typically be used in conjunction
@ -158,7 +158,7 @@ Other deployer impact
The cloud administrator will gain the ability to define flavors which offer
dedicated CPU resources. The administrator will have to place hosts into groups
using aggregates such that the schedular can separate placement of guests with
using aggregates such that the scheduler can separate placement of guests with
dedicated vs shared CPUs. Although not required by this design, it is expected
that the administrator will commonly use the same host aggregates to group
hosts for both CPU pinning and large page usage, since these concepts are
@ -190,7 +190,7 @@ Work Items
* Enhance libvirt to support setup of strict CPU pinning for guests when the
appropriate policy is set in the flavor
* Enhance the schedular to take account of threads policy when choosing
* Enhance the scheduler to take account of threads policy when choosing
which host to place the guest on.
Dependencies

2
specs/juno/implemented/virt-driver-numa-placement.rst
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@ -285,7 +285,7 @@ Work Items
* Enhance libvirt driver to support setup of guest NUMA nodes.
* Enhance libvirt driver to look at NUMA node availability when launching
guest instances and pin all guests to best NUMA node
* Add support to schedular for picking hosts based on the NUMA availability
* Add support to scheduler for picking hosts based on the NUMA availability
instead of simply considering the total RAM/vCPU availability.
Dependencies

10
specs/mitaka/approved/libvirt-real-time.rst
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@ -32,7 +32,7 @@ have sub-optimal characteristics that will cause latency spikes in QEMU,
as may underling host hardware. Avoiding these problems requires that the
host kernel and operating system be configured in a particular manner, as
well as the careful choice of which QEMU features to exercise. It also
requires that suitable schedular policies are configured for the guest
requires that suitable scheduler policies are configured for the guest
vCPUs.
Assigning huge pages to a guest ensures that guest RAM cannot be swapped out
@ -49,9 +49,9 @@ actually demands it.
As an indication of the benefits and tradeoffs of realtime, it is useful
to consider some real performance numbers. With bare metal and dedicated
CPUs but non-realtime schedular policy, worst case latency is on the order
CPUs but non-realtime scheduler policy, worst case latency is on the order
of 150 microseconds, and mean latency is approx 2 microseconds. With KVM
and dedicated CPUs and a realtime schedular policy, worst case latency
and dedicated CPUs and a realtime scheduler policy, worst case latency
is 14 microseconds, and mean latency is < 10 microseconds. This shows
that while realtime brings significant benefits in worst case latency,
the mean latency is still significantly higher than that achieved on
@ -169,10 +169,10 @@ be run on a host pCPU that is completely separate from those
running the vCPUs. This would, for example, allow for running
of guest OS, where all vCPUs must be real-time capable, and so
cannot reserve a vCPU for real-time tasks. This would require
the schedular to treat the emulator threads as essentially being
the scheduler to treat the emulator threads as essentially being
a virtual CPU in their own right. Such an enhancement is considered
out of scope for this blueprint in order to remove any dependency
on schedular modifications. It will be dealt with in a new blueprint
on scheduler modifications. It will be dealt with in a new blueprint
* https://blueprints.launchpad.net/nova/+spec/libvirt-emulator-threads-policy