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

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Date:	Thu, 16 May 2013 09:06:20 +0200
From:	Christoph Paasch <christoph.paasch@...ouvain.be>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] tcp: speedup tcp_fixup_rcvbuf()

Hello Eric,

On Wednesday 15 May 2013 22:25:55 Eric Dumazet wrote:
> tcp_fixup_rcvbuf() contains a loop to estimate initial socket
> rcv space needed for a given mss. With large MTU (like 64K on lo),
> we can loop ~500 times and consume a lot of cpu cycles.
> 
> perf top of 200 concurrent netperf -t TCP_CRR

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.


Thanks,
Christoph

-- 
IP Networking Lab --- http://inl.info.ucl.ac.be
MultiPath TCP in the Linux Kernel --- http://multipath-tcp.org
UCLouvain
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