linux-kernel - Re: [PATCH v2 1/3] mac80211: improve PID rate control mechanism by avoiding rate oscillation problem

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Date:	Mon, 12 Mar 2012 12:14:11 +1100
From:	Julian Calaby <julian.calaby@...il.com>
To:	wei <yinwei168@...il.com>
Cc:	linux-wireless@...r.kernel.org, johannes@...solutions.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] mac80211: improve PID rate control mechanism by
 avoiding rate oscillation problem

Hi Wei,

Much better!

Still a few style comments below.

On Mon, Mar 12, 2012 at 12:07, wei <yinwei168@...il.com> wrote:
> From Wei YIN <Wei.Yin@...ta.com.au>
> Improve PID rate control mechanism by avoiding rate oscillation problem
>
> Signed-off-by: Wei YIN <Wei.Yin@...ta.com.au>
> ---
> kernel 3.3.0
> net/mac80211/rc80211_pid_algo.c | 392 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------------------------------------------------------------------------
> 1 file changed, 317 insertions(+), 75 deletions(-)
>
> --- wireless-testing_orig/net/mac80211/rc80211_pid_algo.c       2012-02-17 13:59:53.495254495 +1000
> +++ wireless-testing/net/mac80211/rc80211_pid_algo.c    2012-03-08 20:00:31.791698813 +1000
> @@ -155,99 +217,239 @@ static void rate_control_pid_sample(stru
>        /* Ignore all frames that were sent with a different rate than the rate
>         * we currently advise mac80211 to use. */
> -       if (info->status.rates[0].idx != spinfo->txrate_idx)
> -               return;
>
> -       spinfo->tx_num_xmit++;
> +       if ((info->status.rates[0].idx != spinfo->txrate_idx) &&
> +                       (info->status.rates[0].idx != spinfo->tmp_rate_idx))
> +               return;

You don't need the parentheses around the != expressions.

> @@ -271,14 +473,17 @@ rate_control_pid_get_rate(void *priv, st
>                info->control.rates[0].count =
>                        txrc->hw->conf.long_frame_max_tx_count;
>        else
> -               info->control.rates[0].count =
> -                       txrc->hw->conf.short_frame_max_tx_count;
> -
> +               info->control.rates[0].count = 2;

Should this be a constant or something? Why is this being set to 2?

> @@ -321,7 +530,7 @@ rate_control_pid_rate_init(void *priv, s
>                s = false;
>                for (j = 0; j < sband->n_bitrates - i; j++)
>                        if (unlikely(sband->bitrates[rinfo[j].index].bitrate >
> -                                    sband->bitrates[rinfo[j + 1].index].bitrate)) {
> +                               sband->bitrates[rinfo[j + 1].index].bitrate)) {

You should drop this whitespace change as it's unrelated to the rest
of your patch.

Thanks,

-- 
Julian Calaby

Email: julian.calaby@...il.com
Profile: http://www.google.com/profiles/julian.calaby/
.Plan: http://sites.google.com/site/juliancalaby/
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