netdev - Re: Synopsys Ethernet QoS

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Message-ID: <20161214125735.GA19542@amd>
Date:   Wed, 14 Dec 2016 13:57:35 +0100
From:   Pavel Machek <pavel@....cz>
To:     Niklas Cassel <niklas.cassel@...s.com>
Cc:     Giuseppe CAVALLARO <peppe.cavallaro@...com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        David Miller <davem@...emloft.net>, larper@...s.com,
        rabinv@...s.com, netdev <netdev@...r.kernel.org>,
        CARLOS.PALMINHA@...opsys.com, Jie.Deng1@...opsys.com,
        Stephen Warren <swarren@...dia.com>
Subject: Re: Synopsys Ethernet QoS

Hi!

> So if there is a long time before handling interrupts,
> I guess that it makes sense that one stream could
> get an advantage in the net scheduler.
> 
> If I find the time, and if no one beats me to it, I will try to replace
> the normal timers with HR timers + a smaller default timeout.
> 

Can you try something like this? Highres timers will be needed, too,
but this fixes the logic problem.

You'll need to apply it twice as code is copy&pasted.

Best regards,
									Pavel

+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

 	 */
 	priv->tx_count_frames += nfrags + 1;
 	if (likely(priv->tx_coal_frames > priv->tx_count_frames)) {
-		mod_timer(&priv->txtimer,
-			  STMMAC_COAL_TIMER(priv->tx_coal_timer));
+		if (priv->tx_count_frames == nfrags + 1)
+			mod_timer(&priv->txtimer,
+				  STMMAC_COAL_TIMER(priv->tx_coal_timer));
 	} else {
 		priv->tx_count_frames = 0;
 		priv->hw->desc->set_tx_ic(desc);


-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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