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git://git.proxmox.com/git/pve-qemu.git
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eee064d954
In qemu-server, we already allocate 2 * $mem_size + 500 MiB for driver
state (which was 32 MiB long ago according to git history). It seems
likely that the 30 MiB cutoff in the savevm-async implementation was
chosen based on that.
In bug #4476 [0], another issue caused the iteration to not make any
progress and the state file filled up all the way to the 30 MiB +
pending_size cutoff. Since the guest is not stopped immediately after
the check, it can still dirty some RAM and the current cutoff is not
enough for a reproducer VM (was done while bug #4476 still was not
fixed), dirtying memory with
> stress-ng -B 2 --bigheap-growth 64.0M'
After entering the final stage, savevm actually filled up the state
file completely, leading to an I/O error. It's probably the same
scenario as reported in the bug report, the error message was fixed in
commit
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| .. | ||
| patches | ||
| source | ||
| changelog | ||
| compat | ||
| control | ||
| copyright | ||
| docs | ||
| kvm-ifdown | ||
| kvm-ifup | ||
| Logo.bmp | ||
| OVMF_CODE-pure-efi.fd | ||
| OVMF_README.txt | ||
| OVMF_VARS-pure-efi.fd | ||
| parse-cpu-flags.pl | ||
| parse-machines.pl | ||
| pve-qemu-kvm.install | ||
| pve-qemu-kvm.links | ||
| pve-qemu-kvm.lintian-overrides | ||
| rules | ||
