netdev - Re: changing the qdisc class speed rate

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Date:	Sat, 30 May 2009 10:19:36 +0200
From:	Piotrek D <regis44@...il.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>, netdev@...r.kernel.org
Subject: Re: changing the qdisc class speed rate

Thanks, this was exactly what I was looking for :)
After multiplying  all of the values in the rtab->data array I have
been able to change the traffic rate for that queue.

Piotrek D.


> /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
>   long it will take to send a packet given its size.
>  */
> static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
> {
>        int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
>        if (slot < 0)
>                slot = 0;
>        slot >>= rtab->rate.cell_log;
>        if (slot > 255)
>                return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
>        return rtab->data[slot];
> }
>
> This function controls rates and these rtab values matter here.
>
> Jarek P.
>

>> --
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