netdev - Re: [PATCH] iproute2: Avoid rounding errors for 100%.

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Message-id: <4AF05821.60303@nets.rwth-aachen.de>
Date:	Tue, 03 Nov 2009 17:19:45 +0100
From:	Arnd Hannemann <hannemann@...s.rwth-aachen.de>
To:	"shemminger@...l.org" <shemminger@...l.org>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Arnd Hannemann <Arnd.Hannemann@...s.rwth-aachen.de>
Subject: Re: [PATCH] iproute2: Avoid rounding errors for 100%.

Although the patch makes sense,
it does not fix the bug/effect we were seeing.
A netem reorder percentage of 100% will still get packets reordered.
(if the netem queue is not empty)


hannemann@...s.rwth-aachen.de wrote:
> From: Arnd Hannemann <hannemann@...s.rwth-aachen.de>
> 
> We noticed that a netem reorder percentage of 100% will still get packets reordered.
> This patch fixes that.
> 
> Signed-off-by: Arnd Hannemann <hannemann@...s.rwth-aachen.de>
> ---
>  tc/tc_util.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/tc/tc_util.c b/tc/tc_util.c
> index fe2c7eb..2641f2e 100644
> --- a/tc/tc_util.c
> +++ b/tc/tc_util.c
> @@ -363,8 +363,10 @@ int get_percent(__u32 *percent, const char *str)
>  		return -1;
>  	if (*p && strcmp(p, "%"))
>  		return -1;
> -
> -	*percent = (unsigned) rint(per * max_percent_value);
> +	if (per == 1.)
> +		*percent = max_percent_value;
> +	else
> +		*percent = (unsigned) rint(per * max_percent_value);
>  	return 0;
>  }
>  


-- 
Dipl.-Inform. Arnd Hannemann
RWTH Aachen University
Dept. of Computer Science, Informatik 4
Ahornstr. 55, D-52074 Aachen, Germany
Phone: (+49 241) 80-21423 Fax: (+49 241) 80-22220
--
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