From: Jakub Kicinski <jakub.kicinski@netronome.com>
To: Jose Abreu <Jose.Abreu@synopsys.com>
Cc: netdev@vger.kernel.org, Joao Pinto <Joao.Pinto@synopsys.com>,
Giuseppe Cavallaro <peppe.cavallaro@st.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
"David S. Miller" <davem@davemloft.net>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next 4/4] net: stmmac: Always use TX coalesce timer value when rescheduling
Date: Sat, 14 Dec 2019 12:28:37 -0800 [thread overview]
Message-ID: <20191214122837.4960adfd@cakuba.netronome.com> (raw)
In-Reply-To: <23c0ff1feddcc690ee66adebefdc3b10031afe1b.1576007149.git.Jose.Abreu@synopsys.com>
On Tue, 10 Dec 2019 20:54:44 +0100, Jose Abreu wrote:
> When we have pending packets we re-arm the TX timer with a magic value.
> Change this from the hardcoded value to the pre-defined TX coalesce
> timer value.
s/pre-defined/user controlled/ ?
> Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
> ---
> Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
> Cc: Alexandre Torgue <alexandre.torgue@st.com>
> Cc: Jose Abreu <joabreu@synopsys.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
> Cc: netdev@vger.kernel.org
> Cc: linux-stm32@st-md-mailman.stormreply.com
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> ---
> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index f61780ae30ac..726a17d9cc35 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -1975,7 +1975,7 @@ static int stmmac_tx_clean(struct stmmac_priv *priv, int budget, u32 queue)
>
> /* We still have pending packets, let's call for a new scheduling */
> if (tx_q->dirty_tx != tx_q->cur_tx)
> - mod_timer(&tx_q->txtimer, STMMAC_COAL_TIMER(10));
> + mod_timer(&tx_q->txtimer, STMMAC_COAL_TIMER(priv->tx_coal_timer));
I think intent of this code is to re-check the ring soon. The same
value of 10 is used in stmmac_tx_timer() for quick re-check.
tx_coal_timer defaults to 1000, so it's quite a jump from 10 to 1000.
I think the commit message leaves too much unsaid.
Also if you want to change to the ethtool timeout value, could you move
stmmac_tx_timer_arm() and reuse that helper?
>
> __netif_tx_unlock_bh(netdev_get_tx_queue(priv->dev, queue));
>
next prev parent reply other threads:[~2019-12-14 20:28 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-10 19:54 [PATCH net-next 0/4] net: stmmac: Improvements for -next Jose Abreu
2019-12-10 19:54 ` [PATCH net-next 1/4] net: stmmac: Print more information in DebugFS DMA Capabilities file Jose Abreu
2019-12-10 19:54 ` [PATCH net-next 2/4] net: stmmac: Always arm TX Timer at end of transmission start Jose Abreu
2019-12-10 19:54 ` [PATCH net-next 3/4] net: stmmac: Let TX and RX interrupts be independently enabled/disabled Jose Abreu
2019-12-14 20:36 ` Jakub Kicinski
2019-12-16 9:18 ` Jose Abreu
2019-12-16 20:14 ` Jakub Kicinski
2019-12-10 19:54 ` [PATCH net-next 4/4] net: stmmac: Always use TX coalesce timer value when rescheduling Jose Abreu
2019-12-14 20:28 ` Jakub Kicinski [this message]
2019-12-16 9:20 ` Jose Abreu
2019-12-16 20:16 ` Jakub Kicinski
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