udp buffer 和reassemble buffer

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udp buffer不足的现象:
'netstat -s' 或 'netstat -su'，并根据具体平台查看
"udpInOverflowsudpInOverflows", "packet receive errors", "fragments dropped" 或 "outgoing packet drop" 信息

调整方法:
wmem_default 和 wmem_max到4M（Linux平台)

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reassemble buffer不足的现象:
在接收节点’netstat -s’输出的 "IP Statistics"
部分提示有大量的Internet Protocol (IP)上的"reassembles failed" 和 "fragments dropped after timeout"信息

调整方法:
net.ipv4.ipfrag_high_thresh
net.ipv4.ipfrag_low_thresh

对net.ipv4.ipfrag_high_thresh的解释:
Maximum memory used to reassemble IP fragments.
When ipfrag_high_thresh bytes of memory is allocated for this purpose,
the fragment handler will toss packets until ipfrag_low_thresh is reached.
INTEGER - (The settable value range)-2147483647 - 2147483647

Default: 262144

【转载自mos中文文章】RAC 环境中 gc block lost 和私网通信性能问题的诊断 (Doc ID 1674865.1)
https://access.redhat.com/solutions/108513#socketlayer

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