Re: Can i use dev_queue_xmit()

["K.Anantha Kiran" <ananth@cse.iitk.ac.in>]

Hi,

  Sorry, we did not put our question in correct way. 
  We came to know that whenever qdisc is full some flag is set and
it will be unset only when qdisc is completely empty once again.
  Because of this we are unable to enque packets in the qdisc even when 
some space is available. What i want is to enqueue packets as soon as 
qdisc has space for atleast one packet.
  Even if i am increasing the qdisc length, then also after some time
again the qdisc is getting full and packets are getting dropped.

 Note: I am using gigabit ethernet cards.

 Please help me in this matter.

Thanks in advance,
Regards,
Ananth.


On Mon, 12 Apr 2004, Anupam wrote:

> Date: Mon, 12 Apr 2004 14:16:43 +0530
> From: Anupam <anupamg@iitk.ac.in>
> To: K.Anantha Kiran <ananth@cse.iitk.ac.in>
> Subject: Re: Can i use dev_queue_xmit()
> 
> K.Anantha Kiran wrote:
> >  	The problem is that " is there any flag that tell the queue is 
> >  full and once it is full it will not take any pkts in and drops all 
> >  till the queue is empty". If so can u plz suggest a solution to this 
> >  problem.
> 
> 
> Hi Anantha,
> 
>  From above description of yours, I presume that you're trying something 
> that is called "Flush Queue", i.e., when a queue is overloaded, there is 
>   option to drop all packets in queue. This means that all the adaptive 
> flow should back-off. However it is quite inefficient since all the 
> backed-off flows will startup again.
> 
> Anyways, I didn't get the chance to dig up the code myself, but my guess 
> is that solution for you lies in: linux/net/sched/cls_api.c.
> 
> 
> >  thanks,
> >  Ananth.
> 
> 
> Please do let me know how things go.
> 
> Regards,
> 
> Anupam Gupta, Ph.D.
> mailto:anupamg@iitk.ac.in
> Deptt. of EE,
> Res. E1-315, Hall-4
> IIT Kanpur.
>