Check some patches from Kirill Smelkov like: https://patchwork.kernel.org/patch/1688591/ On Tue, Apr 9, 2013 at 9:58 AM, Michal Lazo <michal.lazo@xxxxxxxxxxx> wrote: > I want to make API that will provide hw video decoder on Amlogic SOC > it is ARM cortex 9 > > with some proprietary video decoder > > amlogic provide me with working example that generate output frames in > amlvideo driver. > It is v4l2 driver > and it did memcpy to mmap userspace memory > > buffer_y_start=ioremap(cs0.addr,cs0.width*cs0.height); > for(i=0;i<buf->vb.height;i++) { > memcpy(vbuf + pos_dst, buffer_y_start+pos_src, buf->vb.width*3); > pos_dst+=buf->vb.width*3; > pos_src+= cs0.width; > } > > I did it with one memcpy with same cpu load > > https://github.com/Pivosgroup/buildroot-linux-kernel/blob/master/drivers/media/video/amlvideo/amlvideo.c#L218 > > top get me 50% cpu load on this driver for 25fps PAL > > it is really too much > > and funny is that vivi driver(amlvideo is completely base on vivi) get > me same cpu load > > it looks like memcpy isn't cached or something but I don't know how to > identify problem > Any idea how to identify this problem. > > On Mon, Apr 8, 2013 at 2:46 PM, Hans Verkuil <hverkuil@xxxxxxxxx> wrote: >> On Mon April 8 2013 14:42:32 Michal Lazo wrote: >>> Hi >>> 720x576 RGB 25, 30 fps and it take >>> >>> 25% cpu load on raspberry pi(ARM 700Mhz linux 3.6.11) or 8% on x86(AMD >>> 2GHz linux 3.2.0-39) >>> >>> it is simply too much >> >> No, that's what I would expect. Note that vivi was substantially improved recently >> when it comes to the image generation. That will be in the upcoming 3.9 kernel. >> >> This should reduce CPU load by quite a bit if memory serves. >> >> Regards, >> >> Hans >> >>> >>> >>> >>> >>> On Mon, Apr 8, 2013 at 9:42 AM, Peter Senna Tschudin >>> <peter.senna@xxxxxxxxx> wrote: >>> > Dear Michal, >>> > >>> > The CPU intensive part of the vivi driver is the image generation. >>> > This is not an issue for real drivers. >>> > >>> > Regards, >>> > >>> > Peter >>> > >>> > On Sun, Apr 7, 2013 at 9:32 PM, Michal Lazo <michal.lazo@xxxxxxxxxxx> wrote: >>> >> Hi >>> >> V4L2 driver vivi >>> >> generate 25% cpu load on raspberry pi(linux 3.6.11) or 8% on x86(linux 3.2.0-39) >>> >> >>> >> player >>> >> GST_DEBUG="*:3,v4l2src:3,v4l2:3" gst-launch-0.10 v4l2src >>> >> device="/dev/video0" norm=255 ! video/x-raw-rgb, width=720, >>> >> height=576, framerate=30000/1001 ! fakesink sync=false >>> >> >>> >> Anybody can answer me why? >>> >> And how can I do it better ? >>> >> >>> >> I use vivi as base example for my driver >>> >> -- >>> >> To unsubscribe from this list: send the line "unsubscribe linux-media" in >>> >> the body of a message to majordomo@xxxxxxxxxxxxxxx >>> >> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> > >>> > >>> > >>> > -- >>> > Peter >>> >>> >>> >>> > > > > -- > Best Regards > > Michal Lazo > Senior developer manager > mdragon.org > Slovakia -- Peter -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
