Qemu

我們知道無論是 QEMU 或是 librbd 都有提供 writeback cache. 同時也有兩個明顯的效能議題: cache 的生命週期跟隨 QEMU process, 也就是說一旦 VM shutdown, cache 也就跟著消失. 多個 QEMU process 間無法共享 cache, 而這在 »

Today I was trying to increase memory size on a qemu-kvm hosted VM. My plan was as simple as shut it down and then change memory setting via virsh edit <VMName>, but both virsh edit and virsh start throws the same error message:

error: cannot fork child process: Cannot allocate memory