Re: [Bugme-new] [Bug 14685] New: 2.6.30 -> 2.6.31: very high number of RX dropped in bnx2

Re: [Bugme-new] [Bug 14685] New: 2.6.30 -> 2.6.31: very high number of RX dropped in bnx2

[Andrew Morton]

(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Wed, 25 Nov 2009 00:16:00 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=14685
> 
>            Summary: 2.6.30 -> 2.6.31: very high number of RX dropped in
>                     bnx2
>            Product: Drivers
>            Version: 2.5
>     Kernel Version: 2.6.31.6
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Network
>         AssignedTo: drivers_network@kernel-bugs.osdl.org
>         ReportedBy: olel@ans.pl
>         Regression: Yes
> 
> 
> After upgradig my kernel from 2.6.30 to 2.6.31 I'm observing very high number
> of dropped packets on BCM5708(Dell PowerEdge 1950)/BCM5716(Dell PowerEdge R410)
> NICs.
> 
> # uptime ; ifconfig eth0|grep "RX p"; ethtool -S eth0|grep disc
>  01:07:31 up 6 min,  1 user,  load average: 0.00, 0.07, 0.04
>           RX packets:2234 errors:0 dropped:527 overruns:0 frame:0
>      rx_discards: 0
>      rx_fw_discards: 527
> 
> Everything seems to work just fine so I suspect that the driver/firmware is
> counting something wrong.
> 

Re: [Bugme-new] [Bug 14685] New: 2.6.30 -> 2.6.31: very high number of RX dropped in bnx2

[Michael Chan]

Andrew Morton wrote:

> > # uptime ; ifconfig eth0|grep "RX p"; ethtool -S eth0|grep disc
> >  01:07:31 up 6 min,  1 user,  load average: 0.00, 0.07, 0.04
> >           RX packets:2234 errors:0 dropped:527 overruns:0 frame:0
> >      rx_discards: 0
> >      rx_fw_discards: 527
> >

Please report rx_bcast_packets and rx_mcast_packets together with
rx_fw_discards.  Thanks.

Re: [Bugme-new] [Bug 14685] New: 2.6.30 -> 2.6.31: very high number of RX dropped in bnx2

[Krzysztof Oledzki]

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On Mon, 30 Nov 2009, Michael Chan wrote:

> Andrew Morton wrote:
>
>>> # uptime ; ifconfig eth0|grep "RX p"; ethtool -S eth0|grep disc
>>>  01:07:31 up 6 min,  1 user,  load average: 0.00, 0.07, 0.04
>>>           RX packets:2234 errors:0 dropped:527 overruns:0 frame:0
>>>      rx_discards: 0
>>>      rx_fw_discards: 527
>>>
>
> Please report rx_bcast_packets and rx_mcast_packets together with
> rx_fw_discards.  Thanks.

# ethtool -S eth0|egrep "(rx_bcast_packets|rx_mcast_packets|rx_fw_discards)"
      rx_mcast_packets: 2806
      rx_bcast_packets: 790016
      rx_fw_discards: 790016

Best regards,

 				Krzysztof Olędzki

Re: [Bugme-new] [Bug 14685] New: 2.6.30 -> 2.6.31: very high number of RX dropped in bnx2

[Michael Chan]

On Mon, 2009-11-30 at 07:33 -0800, Krzysztof Oledzki wrote:
> # ethtool -S eth0|egrep "(rx_bcast_packets|rx_mcast_packets|
> rx_fw_discards)"
>       rx_mcast_packets: 2806
>       rx_bcast_packets: 790016
>       rx_fw_discards: 790016

This tells me that all the dropped packets are occurring in the iSCSI
ring.

We have recently enabled iSCSI in the kernel and you probably don't have
the userspace components to handle the iSCSI ring.  All broadcast
packets are also received in the iSCSI ring and they are all dropped in
this case without the userspace components.  Networking is not affected.
If you rmmod the bnx2i and cnic drivers, the drop counter should stop
counting.

We have newer firmware that will not include dropped iSCSI packets in
the networking counters.  It should appear in the 2.6.33 kernel
time-frame.

Thanks.

Re: [Bugme-new] [Bug 14685] New: 2.6.30 -> 2.6.31: very high number of RX dropped in bnx2

[Krzysztof Olędzki]

On 2009-11-30 18:44, Michael Chan wrote:
> On Mon, 2009-11-30 at 07:33 -0800, Krzysztof Oledzki wrote:
>> # ethtool -S eth0|egrep "(rx_bcast_packets|rx_mcast_packets|
>> rx_fw_discards)"
>>       rx_mcast_packets: 2806
>>       rx_bcast_packets: 790016
>>       rx_fw_discards: 790016
> 
> This tells me that all the dropped packets are occurring in the iSCSI
> ring.
> 
> We have recently enabled iSCSI in the kernel and you probably don't have
> the userspace components to handle the iSCSI ring.  All broadcast
> packets are also received in the iSCSI ring and they are all dropped in
> this case without the userspace components.  Networking is not affected.
> If you rmmod the bnx2i and cnic drivers, the drop counter should stop
> counting.
> 
> We have newer firmware that will not include dropped iSCSI packets in
> the networking counters.  It should appear in the 2.6.33 kernel
> time-frame.

Yep, it was the cnic driver. Now I feel silly. Thank you for you help 
and sorry for the noise. I going to close it with RESOLVED-DOCUMENTED.

Best regards,

				Krzysztof Olędzki