netdev - Re: [RFC 1/2] netmap: infrastructure (in staging)

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Date:	Fri, 19 Apr 2013 13:31:23 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	David Miller <davem@...emloft.net>, gregkh@...uxfoundation.org,
	netdev@...r.kernel.org
Subject: Re: [RFC 1/2] netmap: infrastructure (in staging)

On Fri, 2013-04-19 at 13:16 -0700, Stephen Hemminger wrote:

> I can not get line rate output with pktgen on existing kernels today.

I have no trouble saturating at line rate with pktgen, and using
multiqueue NIC.

> I can get line rate easily with netmap.

Yes, but then, its about bypassing the OS, and reimplementing everything
in user land. TCP/UDP/IP stack, iptables, rate limiting, sharing a NIC
among users of this NIC, adding new hot points (sending tx descriptors
without caring about need_resched or whatever)

But I agree pktgen is kind of limited (it sends UDP packets.), please do
not compare pktgen and netmap.

pktgen was something to avoid spending time in UDP/IP stack, and it was
probably needed years ago or if network researchers want to use a laptop
as a pktgen host.

It reminds me the days linux had http server in kernel.

With 8+ cpus, you can plainly use a user land application.

I really hope we do not use pktgen as an argument for having netmap in
the kernel.

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