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windows vm also uses max memory allocated

From: Jiatong Shen
Subject: windows vm also uses max memory allocated
Date: Thu, 15 Apr 2021 16:45:56 +0800

Hi, qemu experts,

we are facing an issue that windows vm uses up all memory once booted. for example, if vm has spec of 20G of memory, a linux machine will not uses 20G memory as soon as it boots up, on the contrary, windows vm will uses all that are allocated to it. (issue has also been reported https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1916313)

another observation is that live migrating seems able to bring down rss temporarily until balloon is called next time.

is this expected behavior for a windows guest? thank you


Best Regards,

Jiatong Shen

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