[kata-dev] QEMU 4 and QEMU-lite

Maran Wilson maran.wilson at oracle.com
Tue May 28 19:10:17 UTC 2019

On 5/28/2019 11:54 AM, Whaley, Graham wrote:
>> -----Original Message-----
>> From: Dr. David Alan Gilbert [mailto:dgilbert at redhat.com]
>> Sent: Tuesday, May 28, 2019 7:40 PM
>> To: Montes, Julio <julio.montes at intel.com>; pbonzini at redhat.com
>> Cc: kata-dev at lists.katacontainers.io
>> Subject: Re: [kata-dev] QEMU 4 and QEMU-lite
>> * Montes, Julio (julio.montes at intel.com) wrote:
>>> On Tue, 2019-05-28 at 18:19 +0100, Dr. David Alan Gilbert wrote:
>>>> * Montes, Julio (julio.montes at intel.com) wrote:
>>>>> Hi kata-folks
>>>>> One of the topics in today's agent was QEMU 4 and the work that we
>>>>> are doing to support it in Kata Containers.
>>>>> I ran the boot time and memory footprint metrics in my workstation
>>>>> to compare QEMU 4 vs QEMU-lite (2.11).
>>>>> Here the results.
>>>>> Feel free to comment and raise your concerns about QEMU 4.
>>>> So that looks pretty nice for QEMU 4; at least as fast and in
>>>> the noise on the memory usage?
>>> yeah - IMO QEMU 4 has a good performance and new features, it's a good
>>> hypervisor for Kata Containers.
>> Great!  Please keep running these tests to make sure we don't regress in
>> future versions (especially on our soft-freezes etc so we can spot
>> them before the next release.
> We do have a 'metrics CI' running on Kata, that in theory would detect any major (roughly
> +/- 5%) shifts - but, that would only happen when Kata updates the version of Qemu it is tracking...
> And, yes, we will almost definitely have to tweak that CI to account for the new numbers when we land
> The qemu4 PR ...

Just curious about whether you are providing the uncompressed kernel 
image in these Qemu 4 tests or not. Qemu 4.0 supports booting the 
uncompressed kernel binary in order to reduce boot time (if the kernel 
is version 4.21 or higher with CONFIG_PVH).


> Graham
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