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Re: [Qemu-devel] [PATCH v5 2/5] migration: Parameters for auto-converge
From: |
Jason J. Herne |
Subject: |
Re: [Qemu-devel] [PATCH v5 2/5] migration: Parameters for auto-converge cpu throttling |
Date: |
Fri, 04 Sep 2015 11:09:46 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
On 09/01/2015 05:26 PM, Eric Blake wrote:
On 09/01/2015 08:46 AM, Jason J. Herne wrote:
Add migration parameters to allow the user to adjust the parameters
that control cpu throttling when auto-converge is in effect. The added
parameters are as follows:
x-cpu-throttle-initial : Initial percantage of time guest cpus are throttled
when migration auto-converge is activated.
x-cpu-throttle-increment: throttle percantage increase each time
auto-converge detects that migration is not making progress.
Marked experimental; do we think it will be promoted to stable before
2.5 is released?
Not a clue :) I have no idea how things move from x- to sans x-.
What happens if I set throttle-initial to 50 and throttle-increment to
50? The previous patch required throttle percentage to be between 1 and
99 inclusive; does that mean I cap out at 99 instead of an invalid
throttle of 100?
The call to cpu_throttle_set will take care of the capping. Details
provided in previous reply :)
...
We've missed 2.4; these lines need to say (Since 2.5).
...
# Since: 2.4
...
Would be nice to document the default (20).
...
And again (10). Also, same comment about needing 2.5.
I will fix all of these.
--
-- Jason J. Herne (address@hidden)
- [Qemu-devel] [PATCH v5 0/5] migration: Dynamic cpu throttling for auto-converge, Jason J. Herne, 2015/09/01
- [Qemu-devel] [PATCH v5 5/5] migration: Disambiguate MAX_THROTTLE, Jason J. Herne, 2015/09/01
- [Qemu-devel] [PATCH v5 4/5] qmp/hmp: Add throttle ratio to query-migrate and info migrate, Jason J. Herne, 2015/09/01
- [Qemu-devel] [PATCH v5 1/5] cpu: Provide vcpu throttling interface, Jason J. Herne, 2015/09/01
- [Qemu-devel] [PATCH v5 2/5] migration: Parameters for auto-converge cpu throttling, Jason J. Herne, 2015/09/01
- [Qemu-devel] [PATCH v5 3/5] migration: Dynamic cpu throttling for auto-converge, Jason J. Herne, 2015/09/01