Monday, 2020-10-26

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kata-irc-bot<bergwolf> kata ptg etherpad is created: https://etherpad.opendev.org/p/kata-ptg-2020-Oct please add your names and interested topics if you plan to attend. Thanks!07:21
kata-irc-bot<bergwolf> Interesting work. How does it benefit Kata Containers from using gollvm?07:22
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kata-irc-bot<zjh.20052005> What’s the memory overhead of cloud-hypervisor and qemu in Kata2.0? Per my practice, 250MB for each cloud-hypervisor, and 140MB for each qemu process. Both are under the default configurations of kata.09:19
kata-irc-bot<fidencio> @zjh.20052005, what I've noticed using the QEMU on OCP is an overall increase of ~300MB per pod created. I'm using QEMU + virtiofs.09:24
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kata-irc-bot<zjh.20052005> @fidencio It’s quite big though. Is there any way to mitigate? Seems 2.0 aims to optimize the overhead and performance.09:39
kata-irc-bot<fidencio> 2.0 drops down the agent footprint.09:40
kata-irc-bot<fidencio> I do believe that using virtio-mem in the future we'll also be able to reduce it even more09:41
kata-irc-bot<fidencio> And, obviously, tuning QEMU to do exactly what you need is another way to reduce the footprint09:41
kata-irc-bot<fidencio> I'm using vanilla QEMU from RHEL. So, for sure, things can be improved there.09:41
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kata-irc-bot<zjh.20052005> Thanks @fidencio! It indeed drops, but not considerable enough. Is there any benchmark data for different hypervisors?09:52
kata-irc-bot<fidencio> Hmm. That's a good question. Let me ask help from the experienced folks. @bergwolf, do you remember whether we have benchmark data for all the hypervisors? If so, where?10:01
kata-irc-bot<bergwolf> clh and fc should be much smaller than qemu. qemu 5.0/5.1 is much smaller than older qemu. But I don’t have numbers at hand.10:03
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kata-irc-bot<local.tourist.kiev> Both in Go front-end (cgo) and the back-end (SIMD)17:06
kata-irc-bot<local.tourist.kiev> You can tell which hardware you have, for bare metal testing - and I could prepare the build config.17:06
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kata-irc-bot<archana.m.shinde> @eric.ernst 4am UTC Oct 27 => 9pm PST Oct 2618:42
kata-irc-bot<eric.ernst> so you're saying i should have afternoon coffee today.18:43
kata-irc-bot<eric.ernst> I don't think its the VMM itself, but we need to break this down by component.  Perhaps this is a good topic for PTG.18:43
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kata-irc-bot<archana.m.shinde> pretty much18:59
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kata-irc-bot<archana.m.shinde> @local.tourist.kiev Still not clear to me how this project would benefit Kata?20:54
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kata-irc-bot<bergwolf> vmm, host page pte, guest kernel, kata-agent. these are where most of the memory overhead comes from.23:54
kata-irc-bot<bergwolf> I’ve added it to the ptg topics23:56

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