netdev - Re: [PATCH net-next] tcp: speedup tcp_fixup

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Date:	Thu, 16 May 2013 00:11:16 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	christoph.paasch@...ouvain.be
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] tcp: speedup tcp_fixup_rcvbuf()

On Thu, 2013-05-16 at 09:06 +0200, Christoph Paasch wrote:

> just out of curiosity, how do you run 200 concurrent netperfs?
> Is there an option as in iperf (-P) ?
> I did not find anything like this in the netperf-code.

I am pretty sure there are some scripts in the netperf tree, but I am so
lazy ;)

I use the following shell script : (OK even with old netperf versions)

$ ./super_netperf 200 -t TCP_CRR

$ cat super_netperf 
#!/bin/bash

run_netperf() {
	loops=$1
	shift
	for ((i=0; i<loops; i++)); do
		netperf -s 2 $@ | awk '/Min/{
			if (!once) {
				print;
				once=1;
			}
		}
		{
			if (NR == 6)
				save = $NF
			else if (NR==7) {
				if (NF > 0)
					print $NF
				else
					print save
			} else if (NR==11) {
				print $0
			}
		}' &
	done
	wait
	return 0
}

run_netperf $@ | awk '{if (NF==7) {print $0; next}} {sum += $1} END
{print sum}'



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