Re: ibm_newemac tx problem with jumbo frame enabled

On Fri, Nov 25, 2011 at 10:55 AM, Benjamin Herrenschmidt
[off-list ref] wrote:

On Fri, 2011-11-18 at 10:33 +0530, Prashant Bhole wrote:

quoted

Hi,
I have been facing problem with ibm_newemac driver (v3.54).
The board gets disconnected and can not be pinged in between
some heavy network traffic. In my case I am running IOmeter
"All-in-One" 8 threads on the iSCSI target. MTU is 4088.

I found that after executing emac_full_tx_reset(), the board can
be pinged again. Again after some heavy traffic of 5-6 seconds,
traffic stops. This can be repeated after full tx reset.

Is this a known issue? what could cause this?
Any pointers would be greatly appreciated.

Not that I know of. Can you check if any of the error reporting
registers trip anything ? Could it just be a fifo overflow which we may
not be handling properly in the driver ?

Cheers,
Ben.

Still couldn't find anything like fifo overflow...
I noticed one more thing, this problem happens only when mtu size on
the initiator (the other end) is set to 4088, regardless of any mtu size set
for EMAC.


-
Prashant