netdev - Re: [PATCH 1/2] pktgen: increasing transmission granularity

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Message-ID: <19473.2154.53423.374255@gargle.gargle.HOWL>
Date:	Thu, 10 Jun 2010 17:44:42 +0200
From:	<robert@...julf.net>
To:	Daniel Turull <daniel.turull@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	robert@...julf.net, jens.laas@....uu.se
Subject: Re: [PATCH 1/2] pktgen: increasing transmission granularity




Thanks,

So the scheduling of the next transmission is based on the previous
transmission rather rather than now() + delay.


Cheers
				--ro



Signed-off-by: Robert Olsson <robert.olsson@....uu.se>


>Daniel Turull wrote: This patch correct a bug in the delay of pktgen.
>It makes sure the inter-packet interval is accurate.
>
>Signed-off-by: Daniel Turull <daniel.turull@...il.com>
>
>---
>diff --git a/net/core/pktgen.c b/net/core/pktgen.c index
>2ad68da..1dacd7b 100644 --- a/net/core/pktgen.c +++
>b/net/core/pktgen.c @@ -2170,7 +2170,7 @@ static void spin(struct
>pktgen_dev *pkt_dev, ktime_t spin_until)
> 	end_time = ktime_now();
> 
> 	pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time,
> start_time));
>-	pkt_dev->next_tx = ktime_add_ns(end_time, pkt_dev->delay);
>+	pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
> }
> 
> static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
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