Re: tcp ethernet RX overrun

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,
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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
>
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>


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