Silent data corruption on em(4) interfaces

[hiren panchasara]

On 08/20/15 at 12:57P, KOT MATPOCKuH wrote:
> Hello!
> 
> I got silent data corruption when transferring data via em(4) interface on
> 10.2-STABLE r286912.
> 1. I got broken large file transferred via ftp (MD5 checksum mismatched);
> 2. I got disconnects when transferring large data via ssh with messages:
> Corrupted MAC on input.
> Disconnecting: Packet corrupt
> 
> Problem occurs only after few hours of uptime. Immediately after reboot I
> transferred same file via ftp without any errors.
> 
> I tried to use:
> - em0 and em2 interfaces in link aggregation
> - em1 as "clean" interface
> But I got same problem in both cases.
> 
> Also one time when transferring file I got this messages:
> em0: Interface stopped DISTRIBUTING, possible flapping
> em0: Watchdog timeout -- resetting
> em2: Interface stopped DISTRIBUTING, possible flapping
> em2: Watchdog timeout -- resetting
> 
> netstat -in does not see any problems:
> Name    Mtu Network       Address              Ipkts Ierrs Idrop    Opkts
> Oerrs  Coll
> em0    1500 <Link#1>      00:14:4f:01:3f:7a  6689452     0     0
> 146720     0     0
> em1    1500 <Link#2>      00:14:4f:01:3f:7b  5732168     0     0
> 2865912     0     0
> em2    1500 <Link#3>      00:14:4f:01:3f:7c   501817     0     0
> 3392333     0     0
> 
> Network adapters is build in to the Sun Fire X4100 mother board:
> em0 at pci0:1:1:0: class=0x020000 card=0x10118086 chip=0x10108086 rev=0x03
> hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = '82546EB Gigabit Ethernet Controller (Copper)'
>     class      = network
>     subclass   = ethernet
> 
> TCP_OFFLOAD disabled in kernel's config.

See if disabling TSO helps. You can disable on the interface with
'-tso'.

Cheers,
Hiren
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