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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