netdev - Re: [PATCH net-next v2 3/7] net: mvneta: increase number of buffers in RX and TX queue

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Date:   Fri, 13 Jul 2018 20:17:20 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Gregory CLEMENT <gregory.clement@...tlin.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Jason Cooper <jason@...edaemon.net>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Yelena Krivosheev <yelena@...vell.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Dmitri Epshtein <dima@...vell.com>,
        linux-arm-kernel@...ts.infradead.org,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH net-next v2 3/7] net: mvneta: increase number of buffers
 in RX and TX queue

On Fri, Jul 13, 2018 at 06:18:37PM +0200, Gregory CLEMENT wrote:
> From: Yelena Krivosheev <yelena@...vell.com>
> 
> The initial values were too small leading to poor performance when using
> the software buffer management.

What does this do to latency when a large transfer is also ongoing
(iow, the classic bufferbloat issue) ?

> 
> Signed-off-by: Yelena Krivosheev <yelena@...vell.com>
> [gregory: extract from a larger patch]
> Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
> ---
>  drivers/net/ethernet/marvell/mvneta.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
> index f4e3943a745d..c22df28b07c8 100644
> --- a/drivers/net/ethernet/marvell/mvneta.c
> +++ b/drivers/net/ethernet/marvell/mvneta.c
> @@ -295,10 +295,10 @@
>  #define MVNETA_RSS_LU_TABLE_SIZE	1
>  
>  /* Max number of Rx descriptors */
> -#define MVNETA_MAX_RXD 128
> +#define MVNETA_MAX_RXD 512
>  
>  /* Max number of Tx descriptors */
> -#define MVNETA_MAX_TXD 532
> +#define MVNETA_MAX_TXD 1024
>  
>  /* Max number of allowed TCP segments for software TSO */
>  #define MVNETA_MAX_TSO_SEGS 100
> -- 
> 2.18.0
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

-- 
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