linux-kernel - Re: [PATCH v3] usb: musb: ux500: optimize DMA callback routine

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Date:	Mon, 22 Aug 2011 16:05:40 +0300
From:	Felipe Balbi <balbi@...com>
To:	Per Forlin <per.forlin@...ricsson.com>
Cc:	Felipe Balbi <balbi@...com>,
	Mian Yousaf KAUKAB <mian.yousaf.kaukab@...ricsson.com>,
	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-dev@...ts.linaro.org,
	Per Forlin <per.forlin@...aro.org>
Subject: Re: [PATCH v3] usb: musb: ux500: optimize DMA callback routine

Hi,

On Wed, Aug 17, 2011 at 11:03:40AM +0200, Per Forlin wrote:
> From: Per Forlin <per.forlin@...aro.org>
> 
> Skip the use of work queue and call musb_dma_completion() directly from
> DMA callback context.
> 
> Here follows measurements on a Snowball board with ondemand governor active.
> 
> Performance using work queue:
> (105 MB) copied, 6.23758 s, 16.8 MB/s
> (105 MB) copied, 5.7151 s, 18.3 MB/s
> (105 MB) copied, 5.83583 s, 18.0 MB/s
> (105 MB) copied, 5.93611 s, 17.7 MB/s
> 
> Performance without work queue
> (105 MB) copied, 5.62173 s, 18.7 MB/s
> (105 MB) copied, 5.61811 s, 18.7 MB/s
> (105 MB) copied, 5.57817 s, 18.8 MB/s
> (105 MB) copied, 5.58549 s, 18.8 MB/s
> 
> Signed-off-by: Per Forlin <per.forlin@...aro.org>
> Acked-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@...ricsson.com>

thanks a lot :-) applied.

-- 
balbi

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