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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/deepseek-r1:14b/output/hypervisor/1201447
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloadqemu-analysis-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
qemu-analysis-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
restructure results
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+
+Blue screen when disk uses cache='writeback'
+
+I am running Windows 2008R2 as KVM guest on Ubuntu 12.04 hypervisor. Disk controller and network card are virtio devices with drivers from https://launchpad.net/kvm-guest-drivers-windows/+download (virtio-win-drivers-20120712-1.iso).
+Everything worked fine until I changed disk controller cache from the default (writethrough) to writeback. This introduced occasional blue screens. I noticed that they are linked to high disk IO. For example restoring over 1GB of backup files will results in a blue screen on around 4 out of 5 attempts. Also Windows update crashes the system sometimes. When idle the system will run fine for hours or sometimes even days.
+After removing cache='writeback' from the config everything came back to normal.
+
+qemu-kvm:
+  Installed: 1.0+noroms-0ubuntu14.8
+  Candidate: 1.0+noroms-0ubuntu14.8
+  Version table:
+ *** 1.0+noroms-0ubuntu14.8 0
+        500 http://archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
+        100 /var/lib/dpkg/status
+     1.0+noroms-0ubuntu14.7 0
+        500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
+     1.0+noroms-0ubuntu13 0
+        500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
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