netdev - Re: [patch] pktgen: bug when calling ndelay in x86 architectures

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Date:	Thu, 20 Oct 2011 15:44:13 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Daniel Turull <daniel.turull@...il.com>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Robert Olsson <robert@...julf.net>,
	Voravit Tanyingyong <voravit@....se>,
	Jens Laas <jens.laas@...m.uu.se>
Subject: Re: [patch] pktgen: bug when calling ndelay in x86 architectures

Le jeudi 20 octobre 2011 à 15:22 +0200, Daniel Turull a écrit :
> Hi,
> 
> I tested the patch and it works well.
> 

Thanks !


> 
> I think if we increase the constant to 1ms, we will reduce the jitter if we have
> a rate between 1kpps and 10 kpps, but I guess is not a big deal.
> 


> I've plot this new graph with this patch:
> http://tslab.ssvl.kth.se/pktgen/img/inter_eric1.eps

Unfortunately, the sender cpu might be preempted by timer irq or other
expensive irq, so the Min/Max values are not very different I guess.

I dont understand your Min values.

At 100 pps, how is it possible to have a Min value of ~5000 ns ?


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