Re: 10GE Click performance

Hi Luigi,

Have you guys released the driver for linux yet, or is it still a work in
progress? How does the libpcap emulation compare performance wise with a
native netmap driver?

Beyers

On Fri, Jan 20, 2012 at 8:54 PM, Luigi Rizzo <[email protected]> wrote:

> On Fri, Jan 20, 2012 at 09:19:43AM -0800, Roman Chertov wrote:
> > >
> > > Kinda wonder how prepared click is for the netmap work being done and
> > > 10Gb performance, and if it will help
> >
> > I recall reading on the list that netmap maintains a TX ring and as such
> > it is not friendly to Click configs that can hold on to some packets for
> > a while.
> >
> > FromDevice(ethX) -> cl::Classifier(...)[0]
> >                   -> Queue
> >                   -> DelayShaper(DELAY)
> >                   -> outQ;
> >
> > cl[1] -> outQ;
> >
> > Any clarifications from people familiar with netmap?
>
> Click uses the libpcap emulation to run on top of netmap,
> so it doesn't know anything about the netmap rings.
> Incoming frames are copied into Click's Packets in the callback
> passed tp pcap_dispatch(), and they
> can be stored for as long as you like provided there is
> enough (userspace) memory.
> When it is time to transmit, pcap_inject() copies the payload
> from the Packet to the netmap ring and the packet goes out.
>
> The two copies are moderately expensive but we are still talking
> 3-4Mpps for FromDevice -> EtherSwitch -> ToDevice .
>
> Anything that takes a timestamp is going to hurt much more
> than the memory copies.
>
> cheers
> luigi
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