[Click] FromDevice (OS-X) buffering up packets...

[rchertov at cs.ucsb.edu]

I am seeing similar behavior on Linux as well.  In my case, I carry some
data between two PCs which run user-level click.  If I use RawSocket
element, I get much better performance compared to using To/FromDevice and
manually composing the frames.


On 10:42 am 07/19/10 Nicholas Weaver <nweaver at icsi.berkeley.edu> wrote:
> The test configuration:
> 
> FromDevice(en0, PROMISC true) -> CheckIPHeader(14) ->
>            IPPrint('reply') -> Discard;
> 
> 
> A TCPdump running at the same time gets all the packets as they are
> received, but the click configuration gets them in bursts (but the
> timestamps are right)
> 
> On Jul 19, 2010, at 10:38 AM, Nicholas Weaver wrote:
> 
> > I remember having a similar problem before and I don't remember what
> > the solution is... 
> > On OS-X (latest version, latest devtools), FromDevice is buffering up
> > a large number of packets rather than receiving them in real time. 
> > A TCPdump running at the same time does not have this problem.
> > 
> > 
> > Suggestions?
> > 
> > 
> > 
> 
> 
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