Hello Vamshi You can't completely eliminate dropped packets. There will be drops and errors due to issues in the host and outside the host. In your case, 3 million packets are dropped out of 91 Billion packets received, merely 0.0033%. I doubt, this is an issue. But, if you are in Linux platform, use ethtool -S eth4 to see where the failures occurred. What problem are you trying to solve? Cheers Riyaj Shamsudeen Principal DBA, Ora!nternals - http://www.orainternals.com - Specialists in Performance, RAC and EBS Blog: http://orainternals.wordpress.com OakTable member http://www.oaktable.com and Oracle ACE Director Co-author of the books: Expert Oracle Practices<http://tinyurl.com/book-expert-oracle-practices/>, Pro Oracle SQL, Expert PL/SQL Practices<http://tinyurl.com/book-expert-plsql-practices> Join me for next RAC training in March 2012<http://www.orainternals.com/services/training/advanced-rac-training/>: <http://tinyurl.com/book-expert-plsql-practices> On Tue, May 22, 2012 at 1:21 PM, Vamshi Damidi <dbaprimatics@xxxxxxxxx>wrote: > To all network masters: > Can you please throw some light on how to debug ethernet errors and > overruns. > below is network interface. > > eth4 Link encap:Ethernet HWaddr 00:10:18:98:D7:18 > inet6 addr: fe80::210:18ff:fe98:d718/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:91675115854 errors:3057985 dropped:0 overruns:3057245 > frame:740 > TX packets:20876846657 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:118442063462040 (107.7 TiB) TX bytes:21442788961564 > (19.5 TiB) > Interrupt:40 Memory:dc800000-dcffffff > > We are using 10G broadcom dual nics with tcp buffersize > #SCSI TCP buffer fix > net.core.rmem_max = 1073741824 > net.core.wmem_max = 1073741824 > net.ipv4.tcp_rmem = 1048576 16777216 1073741824 > net.ipv4.tcp_wmem = 1048576 16770216 1073741824 > net.ipv4.tcp_mem = 1048576 16770216 1073741824 > > and iscsi config as below. > > node.startup = automatic > node.session.timeo.replacement_timeout = 120 > node.conn[0].timeo.login_timeout = 15 > node.conn[0].timeo.logout_timeout = 15 > node.conn[0].timeo.noop_out_interval = 10 > node.conn[0].timeo.noop_out_timeout = 15 > node.session.initial_login_retry_max = 4 > node.session.cmds_max = 128 > node.session.queue_depth = 128 > node.session.iscsi.InitialR2T = No > node.session.iscsi.ImmediateData = Yes > node.session.iscsi.FirstBurstLength = 16776192 > node.session.iscsi.MaxBurstLength = 16776192 > # the default is 131072 > node.conn[0].iscsi.MaxRecvDataSegmentLength = 16776192 > # the default is 32768 > discovery.sendtargets.iscsi.MaxRecvDataSegmentLength = 16776192 > node.conn[0].iscsi.HeaderDigest = None > node.session.iscsi.FastAbort = No > > > Thanks, > Vamshi .D > > > -- > //www.freelists.org/webpage/oracle-l > > > -- //www.freelists.org/webpage/oracle-l