Ubuntu eth0ÀÇ dropped Áõ°¡ ¹®Á¦

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안녕하십니까?
Ubuntu 14.04.1 LTS 서버입니다.
$ ifconfig
eth0     
RX packets:24508878 errors:0 dropped:151332 overruns:0 frame:0
eth0의 dropped가 계속 증가합니다.
 
1. dropped이 증가하는 error log는 어디서 볼수있는지요?
2. NIC Drver의 buf는 어떻게 늘리는지요? 수신, skb
 
2cpu의 다른분 질문
 
도움부탁드립니다.
ªÀº±Û Àϼö·Ï ½ÅÁßÇÏ°Ô.
1. dropped packet count¸¦ Á¶ÀÛÇÏ´Â °ÍÀº Ethernet driverÀÔ´Ï´Ù. ¸¸¾à¿¡ ·Î±×°¡ ÀÖ´Ù¸é dmesg·Î È®ÀÎ °¡´ÉÇÏ°ÚÁÒ. ±Ùµ¥.. º¸Åë Rx¿Í °°Àº hot-path¿¡¼­ ·Î±×¸¦ Âï´Â ÀÏÀº ¾ø½À´Ï´Ù..
2. NIC¿¡ ´Þ¾ÆµÎ´Â Rx¿ë skbÀÇ ¼ö´Â driver°¡ Áö¿øÇÏ´Â °æ¿ì¿¡ ÇÑÇØ, ethtool·Î Á¶Àý °¡´ÉÇÕ´Ï´Ù.

»ç¿ëÇÏ°í °è½Å NIC°¡ ¾î¶² °ÍÀÎÁö ±Ã±ÝÇϳ׿ä.
     
¿¡±× 2015-02
ºÐ³ëÀÇ´Ù¿îÈú´Ô ´äº¯ °¨»çÇÕ´Ï´Ù. NIC Á¤º¸ÀÎ°Í °°Àºµ¥ ¸Â´ÂÁö ¸ð¸£°Ú½À´Ï´Ù.
[    0.681728] e1000e: Intel(R) PRO/1000 Network Driver - 2.3.2-k
[    0.681730] e1000e: Copyright(c) 1999 - 2013 Intel Corporation.
[    0.681834] e1000e 0000:00:19.0: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
[    0.681846] e1000e 0000:00:19.0: irq 42 for MSI/MSI-X
[    0.847170] e1000e 0000:00:19.0 eth0: registered PHC clock
[    0.847172] e1000e 0000:00:19.0 eth0: (PCI Express:2.5GT/s:Width x1)
[    0.847173] e1000e 0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection
Á¶Ä¡¹æ¹ýÀÌ ÀÖ´ÂÁö¿ä?
          
Àß ¸ô¶ó¼­ °ü·Ã ºÎºÐÀ» Àá±ñ ºÃ´Âµ¥¿ä. rx_dropped´Â µå¶óÀ̹ö°¡ ¾Æ´Ï¶ó kernel network stack ³»¿¡¼­ Áõ°¡ÇÏ°Ô µÇ³×¿ä. NICÀÇ Rx buffer´Â ¹«°üÇÑ °ÍÀ¸·Î º¸ÀÌ°í.. Ȥ½Ã /proc/sys/net/ipv4/netdev_max_backlog °ªÀ» Å°¿ì¸é Á» ³ª¾ÆÁúÁöµµ ¸ð¸£°Ú½À´Ï´Ù.
               
¿¡±× 2015-02
/proc/sys/net/ipv4/netdev_max_backlog °¡ ¾ø½À´Ï´Ù.
Á¶±Ý´õ ã¾Æ ºÁ¾ßÇÒ°Í °°½À´Ï´Ù.
´äº¯°¨»çµå¸³´Ï´Ù.
À©µµ¿ì10 2015-02
iptables ·ê¿¡¼­ ÀϺΠÆ÷Æ®·Î SYN, ACK Ç÷¡±×¸¦ °¡Áø TCPÆÐŶ¿¡ DROP ó¸® Çß´õ´Ï DROPÄ«¿îÆ®°¡ ¿Ã¶ó°¡´øµ¥¿ä...
     
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Àú°¡ ¸¹ÀÌ ´©Á·ÇÏ¿© ¾î¶²ÀǹÌÀÎÁö ¸ð¸£°Ú½À´Ï´Ù.
´äº¯°¨»çµå¸³´Ï´Ù.


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