On 09/10/2009 04:47 PM, Antti Palosaari wrote:
Aleksandr V. Piskunov wrote:
On Thu, Sep 10, 2009 at 04:12:15PM +0300, Antti Palosaari wrote:
Aleksandr V. Piskunov wrote:
Here is a test case:
Two DVB-T USB adapters, dvb_usb_af9015 and dvb_usb_af9015.
Different tuners,
Err, make it: dvb_usb_af9015 and dvb_usb_ce6230
Those both uses currently too small bulk urbs, only 512 bytes. I have
asked suitable bulk urb size for ~20mbit/sec usb2.0 stream, but
no-one have answered yet (search ml back week or two). I think will
increase those to the 8k to reduce load.
Nice, I'm ready to test if such change helps.
OK, I will make test version in couple of hours.
Here it is, USB2.0 URB is now about 16k both af9015 and ce6230 devices.
Now powertop shows only about 220 wakeups on my computer for the both
sticks.
Please test and tell what powertop says:
http://linuxtv.org/hg/~anttip/urb_size/
I wonder if we can decide what URB size DVB USB drivers should follow
and even add new module param for overriding driver default.
Antti
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