linux-kernel - Re: [PATCH v3] usb: gadget: storage_common: make FSG_NUM

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Date:	Fri, 12 Aug 2011 11:49:00 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Felipe Balbi <balbi@...com>
cc:	Per Forlin <per.forlin@...aro.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linaro-dev@...ts.linaro.org>,
	Michal Nazarewicz <mina86@...a86.com>
Subject: Re: [PATCH v3] usb: gadget: storage_common: make FSG_NUM_BUFFERS
 variable size

On Fri, 12 Aug 2011, Felipe Balbi wrote:

> On Mon, Aug 08, 2011 at 11:43:35PM +0200, Per Forlin wrote:
> > FSG_NUM_BUFFERS is set to 2 as default.
> > Usually 2 buffers are enough to establish a good buffering pipeline.
> > The number may be increased in order to compensate a for bursty VFS
> > behaviour.

> would it make sense to have this as a module parameter so we don't need
> to recompile the driver everytime we want to test the driver with a
> different number of buffers ??
> 
> Alan ?

People generally object to new module parameters unless there's a very 
good reason for them.

Since people won't want to experiment with changing this value unless
they're debugging anyway, we might make it a conditional module
parameter -- don't define the parameter unless CONFIG_USB_DEBUG is
enabled.

Alan Stern

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