htop showing my total mem is 1Gb

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   Poes (poes@mastodon.bsd.cafe)'s status on Sunday, 27-Oct-2024 03:19:29 JST Poes

   I have been renting a VPS with 2 vcpu and 2Gb of RAM. The default OS is Ubuntu 24.04.

   When I checking the system info using top/htop, it is specified that the total RAM capacity of my VPS is 2GB. But when I switched to #openBSD htop show me that my total RAM is 1Gb.

   the dmesg says "irtio0 at pci0 dev 3 function 0 "Qumranet Virtio Memory Balloon" rev 0x00"

   what exactly is this Balloon?