Missmiaom opened a new issue, #1828:
URL: https://github.com/apache/incubator-brpc/issues/1828
实现了基于 length + body 的自定义协议，使用 rpc press
压测发现，下游只有一个节点时，时耗稳定并且耗时很小，如果增加下游节点（使用 rr 模式），耗时99线明显上升。
下游节点机器、性能、网络均大致相同，正常情况下处理时耗较短，并且耗时高的 ip 均匀分布。
**以下是 1 个下游节点的测试情况：**
===========================================================================
2022/07/04-15:38:47 sent:3001 success:3002 error:0
total_error:0 total_sent:261105
2022/07/04-15:38:48 sent:3001 success:3001 error:0
total_error:0 total_sent:264106
2022/07/04-15:38:49 sent:3002 success:3001 error:0
total_error:0 total_sent:267108
2022/07/04-15:38:50 sent:3001 success:3001 error:0
total_error:0 total_sent:270109
[Latency]
avg 428 us
50% 408 us
70% 448 us
90% 589 us
95% 656 us
97% 693 us
99% 788 us
99.9% 3003 us
99.99% 3833 us
max 3860 us
**以下是 26 个下游节点的测试情况：（平均值和 99 线上升明显）**
===========================================================================
2022/07/04-15:36:32 sent:3000 success:2998 error:3
total_error:3 total_sent:138053
2022/07/04-15:36:33 sent:3003 success:3001 error:0
total_error:3 total_sent:141056
2022/07/04-15:36:34 sent:3000 success:3001 error:0
total_error:3 total_sent:144056
2022/07/04-15:36:35 sent:3001 success:3002 error:0
total_error:3 total_sent:147057
2022/07/04-15:36:36 sent:3001 success:3001 error:0
total_error:3 total_sent:150058
[Latency]
avg 4793 us
50% 8525 us
70% 8744 us
90% 8847 us
95% 8894 us
97% 8999 us
99% 9361 us
99.9% 10528 us
99.99% 30792 us
max 48065 us
请问有哪些可能的原因呢？
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