Re: [E1000-devel] 82599 RX queues

[Luca D. <de...@nt...>]

Alex
on 82599 the DROP bit seems to work instead. is there a work-around for 82598 too?

Regards Luca

On May 27, 2011, at 11:48 PM, Luca Deri wrote:

> Hi Alex,
> I have tested your suggestion but unfortunately it does not seem to work. I have verified that the value in the IXGBE_SRRCTL register is set to 12000802 thus the drop bit should be set. Basically sending packets to the card (RSS balanced across RX queues), if I don't consume/read packets on all remaining queues (via ixgbe_clean_rx_irq), even on the queue where I am reading packets, the descriptors are not notifying new packets. I am using a 82598-based card.
> 
> is there anything else you suggest me to try?
> 
> Regards Luca
> 
> 
> 
> On May 25, 2011, at 10:08 PM, Alexander Duyck wrote:
> 
>> On 05/25/2011 06:32 PM, Luca Deri wrote:
>>> Dear all
>>> I am modifying the ixgbe driver for improving packet capture performance. I have noticed that in case of multiple-queue, when one RX queue is full, the card stops receiving packets for all the other queues, even if they have room for packets.
>>> 
>>> Is there a way I can tell the card to keep receiving packets for queue that have room for new packets (i.e. How can I tell the card to have independent queues)?
>>> 
>>> Thanks in advance, Luca
>>> 
>> I would recommend looking into the SRRCTL register and the DROP_EN bit.  By setting the DROP_EN bit in the SRRCTL register the RX FIFO will drop packets for stopped queues instead of back-filling the RX FIFO.  This should allow the queues to function independently without any head of line blocking.
>> 
>> Thanks,
>> 
>> Alex
> 
> ---
> We can't solve problems by using the same kind of thinking we used when we created them - Albert Einstein
> 

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