DWC OTG TX path optimisation for 11-current
Hans Petter Selasky
hps at selasky.org
Wed Aug 12 13:34:27 UTC 2015
On 07/31/15 17:11, Svatopluk Kraus wrote:
> Note that I got about 24000 interrupts per a second during buildworld
> too. If I remember it correctly, it was about 4000 before r285935.
> When the trigger is pulled, the count is changing (in range of 4000 to
> 21000). It looks like something is taking more time (interrupt
> servicing probably). According to "systat -v", disk is going to be
> 100% (and more) busy very often for example.
Hi,
Finally my RPI-2 arrived :-)
After r285935 we are polling for data more frequently, so the IRQ rate
will go up. 3x 8000 IRQs/second would be normal to query the device
every 125us, which the EHCI does.
Can you give me some more information about your setup, so that I can
reproduce it?
How many USB devices are there in total, and how are the filesystems
mounted?
--HPS
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