netdev - Re: get beyond 1Gbps with pktgen on 10Gb nic?

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Date:	Tue, 11 May 2010 21:51:08 -0700
From:	Jesse Brandeburg <jesse.brandeburg@...il.com>
To:	Jon Zhou <Jon.Zhou@...u.com>
Cc:	Ben Greear <greearb@...delatech.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: get beyond 1Gbps with pktgen on 10Gb nic?

On Tue, May 11, 2010 at 9:00 PM, Jon Zhou <Jon.Zhou@...u.com> wrote:
> I just used multi netperf instances to reach 900K pps/8Gb+ traffic on the Broadcom 10G nic:
>
> command:
>
> for i in 1 2 3 4 5 6 7 8 9 10
> do
> netperf -l 60 -H 192.168.0.53 -- -m 60 -s 100M -S 100M &
> done
>
> the msg size was assigned as 64 bytes, but when I checked the file captured by tcpdump,
> found that netperf sent many frames which are large than 64 bytes(i.e.4000-10K+ bytes) and these frames
> were truncated by tcpdump.
>
> so that the actual avg packet size is around 1500 bytes, but what I want is avg packet: 300-400 bytes and reach 5Gb+.
>
> does it make sense?

if you set the TCP_NODELAY (to disable nagle) option on netperf (check
netperf -t TCP_STREAM -- -h) then you should be able to control packet
size.
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