lkml.org 
[lkml]   [2018]   [Jan]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: dvb usb issues since kernel 4.9
On Mon, 8 Jan 2018 22:44:27 +0100
Peter Zijlstra <peterz@infradead.org> wrote:

> On Mon, Jan 08, 2018 at 10:31:09PM +0100, Jesper Dangaard Brouer wrote:
> > I did expected the issue to get worse, when you load the Pi with
> > network traffic, as now the softirq time-budget have to be shared
> > between networking and USB/DVB. Thus, I guess you are running TCP and
> > USB/mpeg2ts on the same CPU (why when you have 4 CPUs?...)
>
> Isn't networking also over USB on the Pi ?

Darn, that is true. Looking at the dmesg output in http://ix.io/DOg:

[ 0.405942] usbcore: registered new interface driver smsc95xx
[ 5.821104] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0x45E1

I don't know enough about USB... is it possible to control which CPU
handles the individual USB ports, or on some other level (than ports)?

--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer

\
 
 \ /
  Last update: 2018-01-14 23:18    [W:0.341 / U:0.012 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site