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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-06-03 12:04:13 +0000 |
|---|---|---|
| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-06-03 12:04:13 +0000 |
| commit | 256709d2eb3fd80d768a99964be5caa61effa2a0 (patch) | |
| tree | 05b2352fba70923126836a64b6a0de43902e976a /results/classifier/105/KVM/1798057 | |
| parent | 2ab14fa96a6c5484b5e4ba8337551bb8dcc79cc5 (diff) | |
| download | qemu-analysis-256709d2eb3fd80d768a99964be5caa61effa2a0.tar.gz qemu-analysis-256709d2eb3fd80d768a99964be5caa61effa2a0.zip | |
add new classifier result
Diffstat (limited to 'results/classifier/105/KVM/1798057')
| -rw-r--r-- | results/classifier/105/KVM/1798057 | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/results/classifier/105/KVM/1798057 b/results/classifier/105/KVM/1798057 new file mode 100644 index 000000000..f778a1e82 --- /dev/null +++ b/results/classifier/105/KVM/1798057 @@ -0,0 +1,55 @@ +KVM: 0.665 +graphic: 0.612 +semantic: 0.609 +other: 0.544 +instruction: 0.523 +device: 0.479 +socket: 0.376 +network: 0.329 +mistranslation: 0.301 +vnc: 0.284 +boot: 0.256 +assembly: 0.092 + +Not able to start instances larger than 1 TB + +Specs: + +CPU: Intel(R) Xeon(R) Gold 6132 CPU @ 2.60GHz +OS: Ubuntu 18.04 AMD64 +QEMU: 1:2.11+dfsg-1ubuntu7.6 (Ubuntu Bionic Package) +Openstack: Openstack Queens (Ubuntu Bionic Package) +Libvirt-daemon: 4.0.0-1ubuntu8.5 +Seabios: 1.10.2-1ubuntu1 + + +The Problem: +We are not able to start instances, which have a memory size over 1 TB. +After starting the instance, they shortly lock up. Starting guests with a lower amount of RAM works +perfectly. We dealt with the same problem in the past with an older Qemu Version (2.5) by patching some source files according to this patch: + +https://git.centos.org/blob/rpms!!qemu-kvm.git/34b32196890e2c41b0aee042e600ba422f29db17/SOURCES!kvm-fix-guest-physical-bits-to-match-host-to-go-beyond-1.patch + + +I think we now have somewhat the same problem here, however the source base changed and I'am not able to find the corresponding snippet to patch this. + +Also, guests show a wrong physical address size which is probably the cause of the lock ups on high memory guests: +root@debug:~# grep physical /proc/cpuinfo +physical id : 0 +address sizes : 40 bits physical, 48 bits virtual + +Any way to fix this? + +Hi Alex, + You should be able to fix this by passing the right cpu flags, e.g.: + +-cpu IvyBridge,host-phys-bits=yes + +or + +-cpu IvyBridge,physbits=46 + +Dave + +I'm assuming that the right physbits setting fixed the bug? ... so I'm marking this ticket as "Invalid". If the problem still persists, then please open again. + |