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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
commitd0c85e36e4de67af628d54e9ab577cc3fad7796a (patch)
treef8f784b0f04343b90516a338d6df81df3a85dfa2 /results/classifier/gemma3:12b/performance/498417
parent7f4364274750eb8cb39a3e7493132fca1c01232e (diff)
downloademulator-bug-study-d0c85e36e4de67af628d54e9ab577cc3fad7796a.tar.gz
emulator-bug-study-d0c85e36e4de67af628d54e9ab577cc3fad7796a.zip
add deepseek and gemma results
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+
+cache=writeback on disk image doesn't do write-back
+
+I noticed that qemu seems to have poor disk performance.  Here's a test that has miserable performance but which should be really fast:
+
+- Configure qemu to use the disk image with cache=writeback
+- Configure a 2GiB Linux VM on an 8GiB Linux host
+- In the VM, write a 4GiB file (dd if=/dev/zero of=/tmp/x bs=4K count=1M)
+- In the VM, read it back (dd if=/tmp/x of=/dev/null bs=4K count=1M)
+
+With writeback, the whole file should end up in the host pagecache.  So when I read it back, there should be no I/O to the real disk, and it should be really fast.  Instead, I see disk activity through the duration of the test, and the performance is roughly the native hard disk throughput (somewhat slower).
+
+I'm using version 0.11.1, and this is my command line:
+
+qemu-system-x86_64 -drive cache=writeback,index=0,media=disk,file=ubuntu.img -k en-us -m 2048 -smp 2 -vnc :3100 -usbdevice tablet -enable-kvm &
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