Date: Tue, 20 Aug 2002 13:29:57 -0700 From: Luigi Rizzo <rizzo@icir.org> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: freebsd-net@FreeBSD.ORG Subject: Re: m_getcl and end-to-end performance Message-ID: <20020820132957.B49141@iguana.icir.org> In-Reply-To: <15714.39494.661931.882244@grasshopper.cs.duke.edu>; from gallatin@cs.duke.edu on Tue, Aug 20, 2002 at 03:36:38PM -0400 References: <15714.27671.533860.408996@grasshopper.cs.duke.edu> <20020820093939.B48541@iguana.icir.org> <15714.39494.661931.882244@grasshopper.cs.duke.edu>
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On Tue, Aug 20, 2002 at 03:36:38PM -0400, Andrew Gallatin wrote: ... > Here's what I'm running with now. It removes the M_PKTHDR > requirement, allowing me to use multiple m_getcl()'s to stock jumbo > frames. ok... there is a minor overhead in initializing m_pkthdr fields for non-pkthdr buffers, but i guess checking the flags bit to possibly skip the block would cost about the same. > For a netperf UDP_STREAM, I see ~1,000 to ~2,000 packets/sec increase > in throughput for sizes 256 through 2K. For large (8K) I see a hmmm... that seems to be in the noise (i assume you are dealing with a fast machine), but probably because there is a lot of per-packet overhead in userland. In my experiments with routing of 64-byte packets i saw the throughput bumping up from 360kpps to over 400kpps on a fast box with Gig-E card, and about 2-3kpps (20 to 22-23kpps) on the soekris box. cheers luigi To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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