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4. /proc/sys/net/ipv4/tcp_sack — ÓÐÑ¡ÔñµÄÓ¦´ð
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7. rmem_max — ½ÓÊÕ´°¿ÚµÄ×î´ó´óС
8. wmem_default — ĬÈϵķ¢ËÍ´°¿Ú´óС
9. wmem_max — ·¢ËÍ´°¿ÚµÄ×î´ó´óС
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