On 15.11.2013 21:13, Devin Heitmueller wrote:
On Fri, Nov 15, 2013 at 2:11 PM, Antti Palosaari <crope@xxxxxx> wrote:
When I do it inside Kernel, in URB completion handler at the same time when
copying data to videobuf2, using pre-calculated LUTs and using mmap it eats
0.5% CPU to transfer stream to app.
When I do same but using libv4lconvert as that patch, it takes ~11% CPU.
How are you measuring? Interrupt handlers typically don't count
toward the CPU performance counters. It's possible that the cost is
the same but you're just not seeing it in "top".
Yes, using top and it is URB interrupt handler where I do conversion. So
any idea how to measure? I think I can still switch LUT to float and see
if it makes difference.
regards
Antti
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