Re: [PATCH] usb: gadget: uvc:change the UVC_NUM_REQUESTS value

Hi, Lipengcheng writes: > The value is 4, it can cache four descriptors. When streaming_interval = 1, > it can tolerate 500us. Some busy scenes, it may be more than 500us because > cpu scheduling is not timely. There will have some problems. It is better > set to eight. >

Re: [PATCH] usb: gadget: uvc:change the UVC_NUM_REQUESTS value

Hi, Lipengcheng writes: > The value is 4, it can cache four descriptors. When streaming_interval = 1, > it can tolerate 500us. Some busy scenes, it may be more than 500us because > cpu scheduling is not timely. There will have some problems. It is better > set to eight. > > Signed-off-by:

RE: [PATCH] usb: gadget: uvc:change the UVC_NUM_REQUESTS value

Hi, > -Original Message- > From: Manu Gautam [mailto:mgau...@codeaurora.org] > Sent: Tuesday, December 26, 2017 1:01 PM > To: Lipengcheng; ba...@kernel.org > Cc: gre...@linuxfoundation.org; linux-kernel@vger.kernel.org; > linux-...@vger.kernel.org > Subject: Re

RE: [PATCH] usb: gadget: uvc:change the UVC_NUM_REQUESTS value

Hi, > -Original Message- > From: Manu Gautam [mailto:mgau...@codeaurora.org] > Sent: Tuesday, December 26, 2017 1:01 PM > To: Lipengcheng; ba...@kernel.org > Cc: gre...@linuxfoundation.org; linux-kernel@vger.kernel.org; > linux-...@vger.kernel.org > Subject: Re

Re: [PATCH] usb: gadget: uvc:change the UVC_NUM_REQUESTS value

Hi, On 12/26/2017 8:22 AM, Lipengcheng wrote: > The value is 4, it can cache four descriptors. When streaming_interval = 1, > it can tolerate 500us. Some busy scenes, it may be more than 500us because > cpu scheduling is not timely. There will have some problems. It is better > set to eight. > >

Re: [PATCH] usb: gadget: uvc:change the UVC_NUM_REQUESTS value

Hi, On 12/26/2017 8:22 AM, Lipengcheng wrote: > The value is 4, it can cache four descriptors. When streaming_interval = 1, > it can tolerate 500us. Some busy scenes, it may be more than 500us because > cpu scheduling is not timely. There will have some problems. It is better > set to eight. > >

[PATCH] usb: gadget: uvc:change the UVC_NUM_REQUESTS value

The value is 4, it can cache four descriptors. When streaming_interval = 1, it can tolerate 500us. Some busy scenes, it may be more than 500us because cpu scheduling is not timely. There will have some problems. It is better set to eight. Signed-off-by: Pengcheng Li ---

[PATCH] usb: gadget: uvc:change the UVC_NUM_REQUESTS value

The value is 4, it can cache four descriptors. When streaming_interval = 1, it can tolerate 500us. Some busy scenes, it may be more than 500us because cpu scheduling is not timely. There will have some problems. It is better set to eight. Signed-off-by: Pengcheng Li ---