netdev - Re: [PATCH 03/10] dpaa_eth: add configurable bpool thresholds

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Date:	Wed, 22 Jul 2015 10:47:08 -0700
From:	Joe Perches <joe@...ches.com>
To:	madalin.bucur@...escale.com
Cc:	netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, scottwood@...escale.com,
	igal.liberman@...escale.com, ppc@...dchasers.com,
	pebolle@...cali.nl, joakim.tjernlund@...nsmode.se
Subject: Re: [PATCH 03/10] dpaa_eth: add configurable bpool thresholds

On Wed, 2015-07-22 at 19:16 +0300, Madalin Bucur wrote:
> Allow the user to tweak the refill threshold and the total number
> of buffers in the buffer pool. The provided values are for one CPU.

Any value in making these module parameters instead?

> +config FSL_DPAA_ETH_MAX_BUF_COUNT
> +	int "Maximum number of buffers in private bpool"
> +	range 64 2048
> +	default "128"
> +	---help---
> +	  The maximum number of buffers to be by default allocated in the DPAA-Ethernet private port's
> +	  buffer pool. One needn't normally modify this, as it has probably been tuned for performance
> +	  already. This cannot be lower than DPAA_ETH_REFILL_THRESHOLD.
> +
> +config FSL_DPAA_ETH_REFILL_THRESHOLD
> +	int "Private bpool refill threshold"
> +	range 32 FSL_DPAA_ETH_MAX_BUF_COUNT
> +	default "80"
> +	---help---
> +	  The DPAA-Ethernet driver will start replenishing buffer pools whose count
> +	  falls below this threshold. This must be related to DPAA_ETH_MAX_BUF_COUNT. One needn't normally
> +	  modify this value unless one has very specific performance reasons.
> +
>  config FSL_DPAA_CS_THRESHOLD_1G
>  	hex "Egress congestion threshold on 1G ports"
>  	range 0x1000 0x10000000



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