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+id = 2920
+title = "VGA Passthrough I/O Lag on DOS (FreeDOS) System."
+state = "closed"
+created_at = "2025-04-12T07:37:11.825Z"
+closed_at = "2025-04-25T12:34:09.224Z"
+labels = ["VFIO"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/2920"
+host-os = "Void Linux"
+host-arch = "x86_64"
+qemu-version = "QEMU emulator version 9.2.93 (v10.0.0-rc3)"
+guest-os = "FreeDOS"
+guest-arch = "x86"
+description = """VGA performance lags with passthrough when the OS is in graphics mode. It also seems to affect when key presses are registered with noticeable delay."""
+reproduce = """1. Install Doom (v1.9 Shareware.)
+2. Run setup and disable sound.
+3. Play game or watch demo."""
+additional = """I have tried multiple cards with no change in performance:
+
+**VGA compatible controller: S3 Graphics Ltd. 86c375 [ViRGE/DX] or 86c385 [ViRGE/GX] (rev 01) (prog-if 00 [VGA controller])   
+VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] R480 [Radeon X800 GTO] (prog-if 00 [VGA controller])**"""