Description of problem: win7-64 guest max support memory 192G. I attached a sreenshot. this is a testing matrix: matrix mem cpu connection usage of vcpu 2G >16 vnc or spice 20% 192 >=16 vnc or spice 100% 192 <16 vnc or spice 100% notes: host info cpu:AMD Opteron(tm) Processor 6172 cpu cores: 48 MEM:512G Version-Release number of selected component (if applicable): # uname -r 2.6.18-336.el5 #rpm -qa|grep kvm # uname -r 2.6.18-336.el5 How reproducible: 100% Steps to Reproduce: 1./usr/libexec/qemu-kvm -m 192G -smp 16 -cpu qemu64,+sse2 -drive file=win7-64,format=qcow2,media=disk,if=virtio,boot=on,werror=stop -net nic,model=virtio,macaddr=04:16:37:51:37:27,vlan=0 -net tap,sndbuf=0,vlan=0,script=/etc/qemu-ifup,downscript=no -uuid 7e8fabbb-ce86-4b2c-8df7-841b4d3901a4 -vnc :1 -boot c -usbdevice tablet -no-hpet -rtc-td-hack -no-kvm-pit-reinjection -monitor stdio -balloon none 2.check usage of cpu in guest 3. Actual results: usage of cpu is 100% Expected results: usage of cpu is <30% Additional info:
Created attachment 606729 [details] win7 screenshot
Try to find specific memory value that cause guest useage of cpu 100%. summuary: Mem cpu duration(usage of cpu(100%) 80G 4cores about 1 minute 90 4cores about 5 minutes 128G 4cores exceed 10minutes(unknow) >128 4cores unknow
For now, deferring to 5.10. Probably we will never fix it. Lets see what happens with the RHEL6 bug 820112 (also interesting is bug 844862).
There is the same issue on Intel host.