RE: packet generator
From: Andrew Gallatin (gallatin_at_cs.duke.edu)
Date: 09/15/04
- Previous message: Julian Elischer: "Re: To many dynamic rules created by infected machine"
- In reply to: Andrew Gallatin: "RE: packet generator"
- Next in thread: Don Bowman: "RE: packet generator"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Date: Tue, 14 Sep 2004 18:02:36 -0400 (EDT) To: "Don Bowman" <don@sandvine.com>
Andrew Gallatin writes:
> 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.
>
The problem here seems to be that rather than just slapping the
packets onto the driver's queue, ng_source passes the mbuf down
to more of netgraph, where there is at least one spinlock,
and the driver's ifq lock is taken and released a zillion times
by ether_output_frame(), etc.
A quick hack (appended) to just slap the mbufs onto the if_snd queue
gets me from ~410Kpps to 1020Kpps. I also see very deep queues
with this (because I'm slamming 4K pkts onto the queue at once..).
This is nearly identical to the linux pktgen figure on the same
hardware, which makes me feel comfortable that there is a lot of
headroom in the driver/firmware API and I'm not botching something
in the FreeBSD driver.
BTW, did you see your 800Kpps on 4.x or 5.x? If it was 4.x, what do
you see on 5.x if you still have the same setup handy?
Thanks,
Drew
_______________________________________________
freebsd-net@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-net
To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
- application/octet-stream attachment: diff to make ng_source skip netgraph detour
- Previous message: Julian Elischer: "Re: To many dynamic rules created by infected machine"
- In reply to: Andrew Gallatin: "RE: packet generator"
- Next in thread: Don Bowman: "RE: packet generator"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Relevant Pages
|
|
