[Click] FromHost Click v1.6

[Roman Chertov]

Lorenzo Bianconi wrote:
> Hi all,
> 
> I am using Click in kernel mode on a system with a three ethernet devices
> and I am trying to understand how is best way to connect the interfaces to
> the router core.
> In order to produce a portable code to other systems (with different number
> of ports),  I am using the Linux bridge utility to define just one interface
> in the Click configuration.
> More precisely I have defined a couple of FromHost/ToHost elements connected
> to the Linux bridge in order to receive/transmit packets from/to the the
> physical devices. Everything works fine but unfortunately
> I have obtained a lower throughput than the one I have achieved with three
> couples of FromDevice/ToDevice elements. I am using Click v1.6 and analysing
> the FromHost code in Click v1.7 I have noticed that in this version was
> added a queue to store incoming packets received from the Linux kernel.
> Is it possible that the FromHost packet managment in Click v1.6 is not very
> efficient (since it handles only one packet at a time) and defining a queue
> for the incoming packet I will obtain a higher throughput?

I doubt that this is the case.  The kernel has its own queue which feeds 
into FromDevice.  You can see the size of this queue by doing 'ifconfig 
<DEV> | grep txqueue'.  FromDevice was changed to avoid locking issues 
which started to appear in 2.6.24.7 kernel (you can search a discussion 
on the issue).  I highly suggest to grab the latest sources out of git 
as 1.7rc1 does not have all the bug fixes which were introduced later.

Roman


> 
> Thanks
> 
> Kind regards
> 
> Lorenzo
> _______________________________________________
> click mailing list
> click at amsterdam.lcs.mit.edu
> https://amsterdam.lcs.mit.edu/mailman/listinfo/click
>