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Code Issues Projects Releases Packages Wiki Activity Actions 10

Kernel: Don't enable write-combine for the Bochs framebuffer device

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While write-combine greatly improves performance on bare metal, QEMU
appears to perform significantly worse when enabling it.
This commit is contained in:
Tom 2022-02-17 20:50:20 -07:00 • committed by Andreas Kling
parent c8aae1ac52
commit 413bc9976c
Notes: sideshowbarker 2024-07-17 18:36:39 +09:00
3 changed files with 9 additions and 2 deletions
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3
Kernel/Graphics/FramebufferDevice.h
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@ -42,6 +42,8 @@ public:
virtual ErrorOr<ByteBuffer> get_edid(size_t head) const override;
void enable_write_combine(bool write_combine) { m_write_combine = write_combine; }
private:
virtual ErrorOr<void> set_head_resolution(size_t head, size_t width, size_t height, size_t pitch) override;
virtual ErrorOr<void> set_head_buffer(size_t head, bool second_buffer) override;
@ -64,6 +66,7 @@ private:
OwnPtr<Memory::Region> m_swapped_framebuffer_region;
bool m_graphical_writes_enabled { true };
bool m_write_combine { true };
RefPtr<Memory::AnonymousVMObject> m_userspace_real_framebuffer_vmobject;
Memory::Region* m_userspace_framebuffer_region { nullptr };