netdev - Re: [PATCH 0/2] Get rid of ndo_xmit

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Date:	Mon, 01 Sep 2014 10:07:39 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	brouer@...hat.com, David Miller <davem@...emloft.net>,
	netdev@...r.kernel.org, therbert@...gle.com, jhs@...atatu.com,
	hannes@...essinduktion.org, edumazet@...gle.com,
	jeffrey.t.kirsher@...el.com, dborkman@...hat.com
Subject: Re: [PATCH 0/2] Get rid of ndo_xmit_flush

Jesper Dangaard Brouer <brouer@...hat.com> writes:
> On Tue, 26 Aug 2014 08:28:15 +0200 Jesper Dangaard Brouer <brouer@...hat.com> wrote:
>> On Mon, 25 Aug 2014 16:34:58 -0700 (PDT) David Miller <davem@...emloft.net> wrote:
>> 
>> > Given Jesper's performance numbers, it's not the way to go.
>> > 
>> > Instead, go with a signalling scheme via new boolean skb->xmit_more.
>> 
>> I'll do benchmarking based on this new API proposal today.
>
> While establish an accurate baseline for my measurements.  I'm
> starting to see too much variation in my trafgen measurements.
> Meaning that we unfortunately cannot use it to measure variations on
> the nanosec scale.
>
> I'm measuring the packets per sec via "ifpps", and calculating an
> average over the measurements, via the following oneliner:
>
>  $ ifpps -clod eth5 -t 1000 | awk 'BEGIN{txsum=0; rxsum=0; n=0} /[[:digit:]]/ {txsum+=$11;rxsum+=$3;n++; printf "instant rx:%u tx:%u pps n:%u average: rx:%d tx:%d pps\n", $3, $11, n, rxsum/n, txsum/n }'

FYI, this is what I use for this kind of thing:
 
       https://github.com/rustyrussell/stats

>From the README:
 This filter finds identical lines and collapses all the numbers into a
 range, average and standard deviation; it can also print out all the
 numbers in CSV form for import into spreadsheets, etc.

Cheers,
Rusty.
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