From: Corentin Labbe <clabbe.montjoie@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: peppe.cavallaro@st.com, alexandre.torgue@st.com,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 13/17] net: stmmac: Implement NAPI for TX
Date: Fri, 3 Feb 2017 14:41:45 +0100 [thread overview]
Message-ID: <20170203134145.GB3653@Red> (raw)
In-Reply-To: <20170131.231225.59679013563845652.davem@davemloft.net>
On Tue, Jan 31, 2017 at 11:12:25PM -0500, David Miller wrote:
> From: Corentin Labbe <clabbe.montjoie@gmail.com>
> Date: Tue, 31 Jan 2017 10:11:48 +0100
>
> > The stmmac driver run TX completion under NAPI but without checking
> > the work done by the TX completion function.
>
> The current behavior is correct and completely intentional.
>
> A driver should _never_ account TX work to the NAPI poll budget.
>
> This is because TX liberation is orders of magnitude cheaper than
> receiving a packet, and such SKB freeing makes more SKBs available
> for RX processing.
>
> Therefore, TX work should never count against the NAPI budget.
>
> Please do not fix something which is not broken.
So at least the documentation I read must be fixed (https://wiki.linuxfoundation.org/networking/napi)
So perhaps the best way is to do like intel igb/ixgbe, keeping under NAPI until the stmmac_tx_clean function said that it finish handling the queue ?
Regards
Corentin Labbe
next prev parent reply other threads:[~2017-02-03 13:41 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-31 9:11 [PATCH 00/17] net: stmmac: misc fix Corentin Labbe
2017-01-31 9:11 ` [PATCH 01/17] net: stmmac: fix the typo on MAC_RNABLE_RX Corentin Labbe
2017-01-31 10:03 ` Giuseppe CAVALLARO
2017-01-31 9:11 ` [PATCH 02/17] net: stmmac: Remove the bus_setup function pointer Corentin Labbe
2017-01-31 10:02 ` Giuseppe CAVALLARO
2017-01-31 9:11 ` [PATCH 03/17] net: stmmac: fix some typos in comments Corentin Labbe
2017-01-31 10:03 ` Giuseppe CAVALLARO
2017-01-31 9:11 ` [PATCH 04/17] net: stmmac: remove freesoftware address Corentin Labbe
2017-01-31 9:11 ` [PATCH 05/17] net: stmmac: remplace asm/io.h by linux/io.h Corentin Labbe
2017-01-31 9:11 ` [PATCH 06/17] net: stmmac: fix some code style problem Corentin Labbe
2017-01-31 10:05 ` Giuseppe CAVALLARO
2017-01-31 9:11 ` [PATCH 07/17] net: stmmac: replace stmmac_mdio_busy_wait by readl_poll_timeout Corentin Labbe
2017-01-31 10:13 ` Giuseppe CAVALLARO
2017-01-31 10:39 ` Corentin Labbe
2017-01-31 10:44 ` Giuseppe CAVALLARO
2017-01-31 9:11 ` [PATCH 08/17] net: stmmac: Use readl_poll_timeout Corentin Labbe
2017-01-31 9:11 ` [PATCH 09/17] net: stmmac: replace ENOSYS by EINVAL Corentin Labbe
2017-01-31 10:06 ` Giuseppe CAVALLARO
2017-01-31 9:11 ` [PATCH 10/17] net: stmmac: Correct the error message about invalid speed Corentin Labbe
2017-01-31 10:07 ` Giuseppe CAVALLARO
2017-01-31 9:11 ` [PATCH 11/17] net: stmmac: Rewrite two test against NULL value Corentin Labbe
2017-01-31 10:07 ` Giuseppe CAVALLARO
2017-01-31 9:11 ` [PATCH 12/17] net: stmmac: rename rx_crc to rx_crc_errors Corentin Labbe
2017-01-31 10:08 ` Giuseppe CAVALLARO
2017-01-31 9:11 ` [PATCH 13/17] net: stmmac: Implement NAPI for TX Corentin Labbe
2017-01-31 10:28 ` Giuseppe CAVALLARO
2017-01-31 13:38 ` Corentin Labbe
2017-02-01 4:12 ` David Miller
2017-02-03 13:41 ` Corentin Labbe [this message]
2017-02-03 15:15 ` David Miller
2017-02-03 15:58 ` Corentin Labbe
2017-01-31 9:11 ` [PATCH 14/17] net: stmmac: print phy information Corentin Labbe
2017-01-31 10:10 ` Giuseppe CAVALLARO
2017-02-03 13:16 ` Corentin Labbe
2017-01-31 9:11 ` [PATCH 15/17] net: stmmac: remove dead code in stmmac_tx_clean Corentin Labbe
2017-01-31 10:21 ` Giuseppe CAVALLARO
2017-01-31 9:11 ` [PATCH 16/17] net: stmmac: remove unused variable in sysfs_display_ring Corentin Labbe
2017-01-31 10:11 ` Giuseppe CAVALLARO
2017-01-31 9:11 ` [PATCH 17/17] net: stmmac: replace unsigned by u32 Corentin Labbe
2017-01-31 10:12 ` Giuseppe CAVALLARO
2017-01-31 10:00 ` [PATCH 00/17] net: stmmac: misc fix Giuseppe CAVALLARO
2017-01-31 10:23 ` Joao Pinto
2017-01-31 10:33 ` Giuseppe CAVALLARO
2017-01-31 10:37 ` Joao Pinto
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