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| kata-irc-bot | <yonatan.gefen> Good morning! Quick question: does each Kata VM instance share the resources with the host OS like runc containers do, or do they statically reserve resources (eg blocks of memory) like traditional VMs? | 14:29 |
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| kata-irc-bot | <jose.carlos.venegas.m> Hi , it is like traditional VMs but by default the memory is requested as needed, each time there is page fault | 14:37 |
| kata-irc-bot | <jose.carlos.venegas.m> @yonatan.gefen There is an option to allocate all the pages at boot but not recommended for density | 14:38 |
| kata-irc-bot | <yonatan.gefen> Great! thank you for the information @jose.carlos.venegas.m! | 14:44 |
| kata-irc-bot | <yonatan.gefen> In that case will it also return memory when it is not needed? | 14:45 |
| kata-irc-bot | <jose.carlos.venegas.m> Not today | 14:45 |
| kata-irc-bot | <jose.carlos.venegas.m> We will needed to add balloon memory, and probably from the agent request to return | 14:46 |
| kata-irc-bot | <sebastien.boeuf> or have some kernel patches allowing the guest to return some memory to the host | 14:47 |
| kata-irc-bot | <jose.carlos.venegas.m> ;P | 14:48 |
| kata-irc-bot | <sebastien.boeuf> problem with ballooning is the QoS | 14:48 |
| kata-irc-bot | <sebastien.boeuf> you cannot guarantee to your VMs that they're gonna have the expected resources all the time | 14:48 |
| kata-irc-bot | <yonatan.gefen> Ok thanks everyone! | 14:49 |
| kata-irc-bot | <sebastien.boeuf> np | 14:49 |
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| kata-irc-bot | <eric.ernst> Hey @yonatan.gefen - keep in mind, some of the memory is indeed shared, but not in the same way as runc. This is achieved by using things like DAX/nvdimm (utilize host's page cache and diectly pass in the rootfs from the host) and using more active deduplication (through KSM). | 15:28 |
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