linux-kernel - Re: [PATCH] usb: dwc3: gadget: Fix ISO transfer performance

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Date:   Wed, 17 May 2017 10:48:44 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Roger Quadros <rogerq@...com>
Cc:     nsekhar@...com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: dwc3: gadget: Fix ISO transfer performance


Hi,

Roger Quadros <rogerq@...com> writes:
> On 21/04/17 15:58, Roger Quadros wrote:
>> Commit 08a36b543803 ("usb: dwc3: gadget: simplify __dwc3_gadget_ep_queue()")
>> caused a small change in the way ISO transfer is handled in the case
>> when XferInProgress event happens on Isoc EP with an active transfer.
>> This caused a performance degradation of 50%. e.g. using g_webcam on DUT
>> and luvcview on host the video frame rate dropped from 16fps to 8fps
>> @high-speed.
>> 
>> Make the ISO transfer handling equivalent to that prior to that commit
>> to get back the original ISO performance numbers.
>> 
>> Fixes: 08a36b543803 ("usb: dwc3: gadget: simplify __dwc3_gadget_ep_queue()")
>> Signed-off-by: Roger Quadros <rogerq@...com>
>
> Any comments?

pull request coming shortly ;-)

-- 
balbi

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