From: Mirza Krak <mirza.krak-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: linux-usb <linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Cc: gregkh <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
johnyoun-HKixBCOQz3hWk0Htik3J/w@public.gmane.org,
linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: High CPU load produced by USB (DW2)
Date: Wed, 7 Feb 2018 10:48:57 +0100 [thread overview]
Message-ID: <CALw8SCXuOCpndakFBRbP7FpJKOSH+nzNStkszWD4XTXVSK1zyQ@mail.gmail.com> (raw)
Hi.
I initially started a thread on a different mailing list [1], and you
can take look there for some additional background.
I am using a 4.14.15 stable kernel on a RK3288 SoC (FireFly RK3288
board) which uses the DW2 USB core. I have noticed that when
connecting a USB device there is unreasonable high CPU load produced
by the USB interrupts.
Here is one example with a MIDI keyboard connected on USB (not really
doing anything on it)
79 2 root SW 0 0% 19% [irq/45-dwc2_hso]
78 2 root SW 0 0% 11% [irq/45-ff540000]
Can also see that there is a "HIGH" interrupt count
root@esp5-d1:~# watch cat /proc/interrupts | grep usb
45: 43681938 0 0 0 GIC-0 57 Level
ff540000.usb, dwc2_hsotg:usb1
46: 0 0 0 0 GIC-0 55 Level
ff580000.usb, ff580000.usb, dwc2_hsotg:usb2
45: 43829473 0 0 0 GIC-0 57 Level
ff540000.usb, dwc2_hsotg:usb1
46: 0 0 0 0 GIC-0 55 Level
ff580000.usb, ff580000.usb, dwc2_hsotg:usb2
45: 43972333 0 0 0 GIC-0 57 Level
ff540000.usb, dwc2_hsotg:usb1
46: 0 0 0 0 GIC-0 55 Level
ff580000.usb, ff580000.usb, dwc2_hsotg:usb2
45: 44118769 0 0 0 GIC-0 57 Level
ff540000.usb, dwc2_hsotg:usb1
46: 0 0 0 0 GIC-0 55 Level
ff580000.usb, ff580000.usb, dwc2_hsotg:usb2
45: 44267876 0 0 0 GIC-0 57 Level
ff540000.usb, dwc2_hsotg:usb1
46: 0 0 0 0 GIC-0 55 Level
ff580000.usb, ff580000.usb, dwc2_hsotg:usb2
Again not really doing anything with the device, it is just connected.
I have also tested with server different devices with same result (BT
and WLAN).
The CPU load is exposed when I add "threadirqs" to kernel arguments,
otherwise it does not seem that it accounted for (not see in "top")
but the number of interrupts is still high.
Any thoughts on this? Please let me know if there is additional
information that I can provide to help debug this.
[1]. https://www.spinics.net/lists/linux-rt-users/msg18341.html
--
Med Vänliga Hälsningar / Best Regards
Mirza Krak
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next reply other threads:[~2018-02-07 9:48 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-07 9:48 Mirza Krak [this message]
[not found] ` <CALw8SCXuOCpndakFBRbP7FpJKOSH+nzNStkszWD4XTXVSK1zyQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-07 14:27 ` High CPU load produced by USB (DW2) gregkh
2018-02-08 8:50 ` Minas Harutyunyan
2018-02-08 11:02 ` Minas Harutyunyan
[not found] ` <410670D7E743164D87FA6160E7907A560113A67F86-ouFQeoKRuQ8bQ7k9MBbv4fufCSb+aD3WLzEdoUbNIic@public.gmane.org>
2018-02-08 13:06 ` Mirza Krak
2018-02-08 13:53 ` Minas Harutyunyan
[not found] ` <410670D7E743164D87FA6160E7907A560113A68287-ouFQeoKRuQ8bQ7k9MBbv4fufCSb+aD3WLzEdoUbNIic@public.gmane.org>
2018-02-14 8:57 ` Mirza Krak
2018-02-14 12:07 ` Minas Harutyunyan
[not found] ` <410670D7E743164D87FA6160E7907A560113A6B365-ouFQeoKRuQ8bQ7k9MBbv4fufCSb+aD3WLzEdoUbNIic@public.gmane.org>
2018-02-15 13:20 ` Mirza Krak
2018-02-16 5:59 ` Minas Harutyunyan
[not found] ` <410670D7E743164D87FA6160E7907A560113A6C4CA-ouFQeoKRuQ8bQ7k9MBbv4fufCSb+aD3WLzEdoUbNIic@public.gmane.org>
2018-02-16 20:07 ` Marek Vasut
2018-02-19 8:19 ` Minas Harutyunyan
[not found] ` <410670D7E743164D87FA6160E7907A560113A6E9E6-ouFQeoKRuQ8bQ7k9MBbv4fufCSb+aD3WLzEdoUbNIic@public.gmane.org>
2018-02-19 8:51 ` Marek Vasut
2018-02-19 10:11 ` Minas Harutyunyan
[not found] ` <410670D7E743164D87FA6160E7907A560113A6EB2B-ouFQeoKRuQ8bQ7k9MBbv4fufCSb+aD3WLzEdoUbNIic@public.gmane.org>
2018-02-19 17:02 ` Marek Vasut
2018-02-20 5:51 ` Minas Harutyunyan
[not found] ` <410670D7E743164D87FA6160E7907A560113A6F1B4-ouFQeoKRuQ8bQ7k9MBbv4fufCSb+aD3WLzEdoUbNIic@public.gmane.org>
2018-03-05 17:37 ` Marek Vasut
2018-03-06 6:45 ` Minas Harutyunyan
2018-03-06 8:09 ` Minas Harutyunyan
[not found] ` <410670D7E743164D87FA6160E7907A560113AB3F3D-ouFQeoKRuQ8bQ7k9MBbv4fufCSb+aD3WLzEdoUbNIic@public.gmane.org>
2018-03-07 22:42 ` Marek Vasut
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