Merge pull request #15 from CaFeZn/docs/clarify-can-throughput

说明 CAN 测试中的有效载荷吞吐率与物理波特率的关系

Author: CaFeZn

docs/perf/perf-can.md

@@ -63,7 +63,7 @@ sidebar_position: 2
 
 ### 标准帧 8字节数据
 
-8917包/s，每包108位，数据段的速率为0.57Mbps，平均总线负载接近100%
+8917包/s，每包108位，数据段的速率[^1]为0.57Mbps，平均总线负载接近100%
 
 理想情况下，数据段的速率位`64 / 108 * 1Mbps / 105% = 0.564Mbps`
 
@@ -81,11 +81,13 @@ sidebar_position: 2
 
 ### FD标准帧 64字节数据
 
-3929包/s，数据段的速率为2.01Mbps，平均总线负载接近100%
+3929包/s，数据段的速率[^1]为2.01Mbps，平均总线负载接近100%
 
 ### FD拓展帧 64字节数据
 
-3617包/s，数据段的速率为1.85Mbps，平均总线负载接近100%
+3617包/s，数据段的速率[^1]为1.85Mbps，平均总线负载接近100%
+
+[^1]: 此处“数据段的速率”指有效载荷吞吐率，即 `包/s × 每包数据字节数 × 8`，不是 CAN FD 控制器中配置的物理数据段 bit rate；按本文测试条件说明，FD 数据段物理 bit rate 为 2.5Mbps。
 
 ## 总结
 

i18n/en/docusaurus-plugin-content-docs/current/perf/perf-can.md

@@ -63,7 +63,7 @@ Bit stuffing is estimated at 5%.
 
 ### Standard Frame (8-byte data)
 
-8917 packets/s, 108 bits per frame, data segment rate = 0.57 Mbps, bus load ≈ 100%
+8917 packets/s, 108 bits per frame, data segment rate[^1] = 0.57 Mbps, bus load ≈ 100%
 
 Ideal case: `64 / 108 * 1Mbps / 105% = 0.564 Mbps`
 
@@ -81,11 +81,13 @@ Ideal case: `64 / 108 * 1Mbps / 105% = 0.564 Mbps`
 
 ### FD Standard Frame (64-byte data)
 
-3929 packets/s, data segment rate = 2.01 Mbps, bus load ≈ 100%
+3929 packets/s, data segment rate[^1] = 2.01 Mbps, bus load ≈ 100%
 
 ### FD Extended Frame (64-byte data)
 
-3617 packets/s, data segment rate = 1.85 Mbps, bus load ≈ 100%
+3617 packets/s, data segment rate[^1] = 1.85 Mbps, bus load ≈ 100%
+
+[^1]: Here, “data segment rate” means effective payload throughput, calculated as `packets/s × payload bytes per packet × 8`. It is not the physical CAN FD data-phase bit rate configured in the controller; according to the test conditions above, the physical FD data-phase bit rate is 2.5 Mbps.
 
 ## Summary