USB: OHCI: high softirq load

[Antoine Aubert]

Hi,

Im working on a AT91SAM9G25cu board
(arch/arm/boot/dts/at91-kizboxmini.dts). We use linux-4.1.31, and when
OHCI is enabled, I got some wired effects.

eg with 3 FTDI pluged, interrupts: more than 3.5k/s, cpu softirq > 24%,
loadavg > 0.5

This issue disappear when disabling OHCI and use EHCI only.

What are the usual causes, and where to begin with ?

Thanks in advance,

-- 
Antoine Aubert
a.aubert at overkiz.com