[Click] question about linuxmodule/fromdevice

[Roman Chertov]

What I meant was that I modified the device driver to do what my element 
was supposed to do.  So just after the DMA transfer is done from the 
device into the main memory, I perform the necessary operation on the 
packets.

Mythili Vutukuru wrote:
>> I had a similar requirement.  I just modified the device driver to
>> reduce the latency to suit my needs.
>>
> But in my case, the latency between the NIC and the driver is minimal.
> Most of the delay is after FromDevice has the packet but does not release
> it to the downstream click elements.
> 
> Mythili
> 
>>
>> Mythili Vutukuru wrote:
>>> Hi,
>>> I am running click version 1.5.0. The application I am building requires
>>> that the delay between the network interface receiving the packet and my
>>> custom click element processing the packet be minimum. Currently, the
>>> FromDevice element queues up packets at interrupt time, and pushes them
>>> out of its output when the task in the element is scheduled. I want to
>>> reduce this delay. First question: is there any obvious way to do this?
>>> I tried increasing the tickets of FromDevice using ScheduleInfo, but it
>>> did not help.
>>>
>>> An obvious (but possibly flawed) approach I thought of is the following:
>>> make FromDevice push out the packets at interrupt time itself to other
>>> elements downstream. Second question: does running some click element
>>> code at interrupt time break anything fundamental in the click
>>> architecture?
>>>
>>> Thanks a lot, any help is much appreciated.
>>>
>>> Mythili
>>>
>>>
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>>>
>>
> 
>