On Tue, Oct 18, 2016 at 4:42 AM,  <ava...@itu.edu.tr> wrote:
> Hello
>
> I'm trying to implement CoDel-like implementation on Intel's DPDK library,
> but I have trouble with measuring packet sojourn time on RX/TX queues
> because of DMA usage. When I call send() function, DPDK puts the packets
> into DMA-region and I have no idea when the packets sent really into
> network. Likewise, when I call recv(), I don't have any idea when the
> packets arrived, so I'm not sure totally but I think I have no chance to
> measure sojourn time for dma-like implementation. Could you please correct
> me if I'm wrong. Also any comments/suggestions would be greatly appreciated.

I am under the impression there is a dpdk implementation already, somewhere.

As for the amount of time things spend in dma, you are hopefully
talking about a few mere
us, and the default for codel is only worrying about ms, so you can do
the codel work before the send and after the recv.

> Thanks in advance..
>
> - Volkan
>
>
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> https://lists.bufferbloat.net/listinfo/codel
>



-- 
Dave Täht
Let's go make home routers and wifi faster! With better software!
http://blog.cerowrt.org
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