Date: Mon, 13 Sep 2004 17:13:21 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: "Don Bowman" <don@sandvine.com> Cc: freebsd-net@freebsd.org Subject: RE: packet generator Message-ID: <16710.3441.49431.847790@grasshopper.cs.duke.edu> In-Reply-To: <A8535F8D62F3644997E91F4F66E341FC150AE4@exchange.sandvine.com> References: <A8535F8D62F3644997E91F4F66E341FC150AE4@exchange.sandvine.com>
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Don Bowman writes:
> From: owner-freebsd-net@freebsd.org
> > [mailto:owner-freebsd-net@freebsd.org]On Behalf Of Andrew Gallatin
> > Sent: September 10, 2004 19:08 PM
> > To: freebsd-net@freebsd.org
> > Subject: packet generator
> >
> > Does anybody have a free, in-kernel tool to generate packets quicky
> > and send them out a particular etherent interface on FreeBSD?
> > Something similar to pktgen on linux?
> >
> > I'm trying to excersize just the send-side of programmable firmware
> > based NIC. The recieve side of the NIC firmware is not yet written,
> > but I want to get started tuning and shaking the bugs out of the send
> > side while the firmware author does the recieve path. The packets
> > just get dropped on the floor by the NIC, so its a good way to test
> > the interface..
> >
>
> ng_source was a netgraph module we wrote and contributed.
> It can transmit ~800Kpps on a PCI-X system. The code is in
> src/sys/netgraph/ng_source.c.
I finally figured out that ngctl shutdown mx0:orphans will get things reset
enough so that I can re-run the test.
I send 1.6 million packets and set things up so that I see
these stats at the end:
Args: { outOctets=102400000 outFrames=1600000 queueOctets=64
queueFrames=1 startTime={ tv_sec=1095109553 tv_usec=628521 } endTime={
tv_sec=1095109557 tv_usec=546685 } elapsedTime={ tv_sec=3 tv_usec=918164 } }
If I put counters in my driver's xmit routine, I see that my driver's
xmit routine was called 683441 times. This means that the queue was
only a little over two packets deep on average, and vmstat shows idle
time. I've tried piping additional packets to nghook mx0:orphans
input, but that does not seem to increase the queue depth.
My default send queue maxlen is 255 (hw send fifo size) and I (think)
I see ng_source increasing it:
ng_source: changing ifq_maxlen from 255 to 4096
Hmm.. I wonder if I need to increase hz..
Thanks,
Drew
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