gxkevin opened a new issue #874: 请问，bar中，关于iobuf的监控项分别代表什么意思，有什么作用？ URL: https://github.com/apache/incubator-brpc/issues/874 目前项目中遇到个问题，就是解析pb的时间占比过高，占整体耗时接近20%，十几ms，即brpc::processRpcRequest -> brpc::parsePbFromIOBuf -> brpc::ParsePbFromIOBuf，看到brpc bvar的一些监控项，不太了解iobuf相关的监控项含义，比如： iobuf_block_count : 1454 iobuf_block_count_hit_tls_threshold : 26326739 （这个tls代表什么意思？） iobuf_block_memory : 1183824 iobuf_newbigview_second : 49 另外，parsePb耗时过高的话，能给我一些建议么，相关的火焰图在附件里面 [perf-kernel.zip](https://github.com/apache/incubator-brpc/files/3465669/perf-kernel.zip)
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