netdev - RE: [PATCH] Increase virtual FIFOs in ucc

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Date:	Tue, 11 Dec 2007 17:49:46 +0800
From:	"Li Yang" <LeoLi@...escale.com>
To:	"Joakim Tjernlund" <Joakim.Tjernlund@...nsmode.se>,
	<netdev@...r.kernel.org>
Subject: RE: [PATCH] Increase virtual FIFOs in ucc_geth.

> -----Original Message-----
> From: Joakim Tjernlund [mailto:Joakim.Tjernlund@...nsmode.se] 
> Sent: Tuesday, December 11, 2007 2:46 AM
> To: Li Yang-r58472 <LeoLi@...escale.com> Netdev
> Cc: Joakim Tjernlund
> Subject: [PATCH] Increase virtual FIFOs in ucc_geth.
> 
> Increase UCC_GETH_URFS_INIT to 1152 and
> UCC_GETH_UTFS_INIT to 896 to avoid HW Overrun/Underrun.

Please be noted that these values are only used for 10/100Mbps speed.
Did you get Overrun in 10/100M mode?

- Leo

> 
> Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
> ---
>  drivers/net/ucc_geth.h |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ucc_geth.h b/drivers/net/ucc_geth.h 
> index bb4dac8..d3f030b 100644
> --- a/drivers/net/ucc_geth.h
> +++ b/drivers/net/ucc_geth.h
> @@ -923,11 +923,11 @@ struct ucc_geth_hardware_statistics {
>  #define PHY_CHANGE_TIME                         2
>  
>  /* Fast Ethernet (10/100 Mbps) */
> -#define UCC_GETH_URFS_INIT                      512	/* Rx 
> virtual FIFO size
> +#define UCC_GETH_URFS_INIT                      1152	/* Rx 
> virtual FIFO size
>  							 */
>  #define UCC_GETH_URFET_INIT                     256	/* 1/2 urfs */
>  #define UCC_GETH_URFSET_INIT                    384	/* 3/4 urfs */
> -#define UCC_GETH_UTFS_INIT                      512	/* Tx 
> virtual FIFO size
> +#define UCC_GETH_UTFS_INIT                      896	/* Tx 
> virtual FIFO size
>  							 */
>  #define UCC_GETH_UTFET_INIT                     256	/* 1/2 utfs */
>  #define UCC_GETH_UTFTT_INIT                     128
> --
> 1.5.3.6
> 
> 
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