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authorChristian Krinitsin <mail@krinitsin.com>2025-06-30 12:24:58 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-06-30 12:27:06 +0000
commit33606b41d35115f887ea688b1a16f2ff85bf2fe4 (patch)
tree406b2c7b19a087ba437c68f3dbf0b589fa1d6150 /results/scraper/launchpad-without-comments/1119861
parentadedf8771bc4de3113041ca21bd4d0d1c0014b6a (diff)
downloadqemu-analysis-33606b41d35115f887ea688b1a16f2ff85bf2fe4.tar.gz
qemu-analysis-33606b41d35115f887ea688b1a16f2ff85bf2fe4.zip
add launchpad bug reports without comments
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+Poor console performance in Windows 7
+
+As part of its conformance test suite, Wine tests the behavior of the Windows console API. Part of this test involves opening a test console and scrolling things around. The test probably does not need to perform that many scroll operations to achieve its goal. However as is it illustrates a significant performance issue in QEmu. Unfortunately it does so by timing out (the tests must run in less than 2 minutes). Here are the run times on a few configurations:
+
+ 10s - QEmu 1.4 + Q9450@2.6GHz + Windows XP + QXL + QXL driver
+  8s - QEmu 1.12 + Opteron 6128 + Windows XP + QXL + QXL driver
+127s - QEmu 1.12 + Opteron 6128 + Windows 7 + cirrus + vga driver
+127s - QEmu 1.12 + Opteron 6128 + Windows 7 + QXL + QXL driver
+147s - QEmu 1.12 + Opteron 6128 + Windows 7 + vmvga + vga driver
+145s - QEmu 1.12 + Opteron 6128 + Windows 7 + vmvga + vmware driver (xpdm, no better with all graphics effects disabled)
+
+ 10s - Metal + Atom N270 + Windows XP + GMA 950 + Intel driver
+  6s - Metal + i5-3317U + Windows 8 + HD4000 + Intel driver
+  3s - VMware + Q9450@2.6GHz + Windows XP + vmvga + vmware driver
+ 65s - VMware + Q9450@2.6GHz + Windows 7 + vmvga + vmware driver
+
+So when running on the bare metal all versions of Windows are about as fast. However in QEmu Windows 7 is almost 16 times slower than Windows XP! VMware is impacted too but it's still maintains a good lead in performance.
+
+Disabling all graphics effects did not help so it's not clear that the fault lies with Windows 7's compositing desktop window manager. Maybe it has to do with the lack of a proper wddm driver?
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