Em Fri, 26 Jan 2018 17:37:39 -0200
Mauro Carvalho Chehab escreveu:
> Em Fri, 26 Jan 2018 12:17:37 -0200
> Mauro Carvalho Chehab escreveu:
>
> > Hi Alan,
> >
> > Em Mon, 8 Jan 2018 14:15:35 -0500 (EST)
> > Alan Stern escreveu:
> >
> > > On Mon, 8 Jan 2018, Linus Torvalds wrote:
> > >
>
Em Fri, 26 Jan 2018 12:17:37 -0200
Mauro Carvalho Chehab escreveu:
> Hi Alan,
>
> Em Mon, 8 Jan 2018 14:15:35 -0500 (EST)
> Alan Stern escreveu:
>
> > On Mon, 8 Jan 2018, Linus Torvalds wrote:
> >
> > > Can somebody tell which softirq it is that dvb/usb cares about?
> >
> > I don't kno
Hi Alan,
Em Mon, 8 Jan 2018 14:15:35 -0500 (EST)
Alan Stern escreveu:
> On Mon, 8 Jan 2018, Linus Torvalds wrote:
>
> > Can somebody tell which softirq it is that dvb/usb cares about?
>
> I don't know about the DVB part. The USB part is a little difficult to
> analyze, mostly because the bu
Em Sat, 13 Jan 2018 07:09:20 -0200
Mauro Carvalho Chehab escreveu:
> Em Fri, 12 Jan 2018 13:48:46 -0800
> Eric Dumazet escreveu:
>
> > On Fri, 2018-01-12 at 19:13 -0200, Mauro Carvalho Chehab wrote:
> > >
> > >
> > > The .config file used to build the Kernel is at:
> > > https://pastebin.co
Em Fri, 12 Jan 2018 13:48:46 -0800
Eric Dumazet escreveu:
> On Fri, 2018-01-12 at 19:13 -0200, Mauro Carvalho Chehab wrote:
> >
> >
> > The .config file used to build the Kernel is at:
> > https://pastebin.com/wpZghann
> >
>
> Hi Mauro
>
> Any chance you can try CONFIG_HZ_1000=y, CONFIG_
On Fri, 2018-01-12 at 19:13 -0200, Mauro Carvalho Chehab wrote:
>
>
> The .config file used to build the Kernel is at:
> https://pastebin.com/wpZghann
>
Hi Mauro
Any chance you can try CONFIG_HZ_1000=y, CONFIG_HZ=1000 ?
Thanks.
Em Tue, 9 Jan 2018 09:48:47 -0800
Linus Torvalds escreveu:
> On Tue, Jan 9, 2018 at 9:27 AM, Eric Dumazet wrote:
> >
> > So yes, commit 4cd13c21b207 ("softirq: Let ksoftirqd do its job") has
> > shown up multiple times in various 'regressions'
> > simply because it could surface the problem more
On Tue, 9 Jan 2018 10:58:30 -0800 Linus Torvalds
wrote:
> So I really think "you can use up 90% of CPU time with a UDP packet
> flood from the same network" is very very very different - and
> honestly not at all as important - as "you want to be able to use a
> USB DVB receiver and watch/recor
On Tue, 2018-01-09 at 22:26 +0100, Jesper Dangaard Brouer wrote:
>
> I've previously experienced that you can be affected by the scheduler
> granularity, which is adjustable (with CONFIG_SCHED_DEBUG=y):
>
> $ grep -H . /proc/sys/kernel/sched_*_granularity_ns
> /proc/sys/kernel/sched_min_granula
On Tue, Jan 9, 2018 at 10:58 AM, Linus Torvalds
wrote:
> On Tue, Jan 9, 2018 at 9:57 AM, Eric Dumazet wrote:
>>
>> Your patch considers TASKLET_SOFTIRQ being a candidate for 'immediate
>> handling', but TCP Small queues heavily use TASKLET,
>> so as far as I am concerned a revert would have the s
On Tue, 9 Jan 2018 15:42:35 -0200 Mauro Carvalho Chehab
wrote:
> Em Mon, 8 Jan 2018 11:51:04 -0800 Linus Torvalds
> escreveu:
>
[...]
> Patch makes sense to me, although I was not able to test it myself.
The patch also make sense to me. I've done some basic testing with it
on my high-end B
On Tue, Jan 9, 2018 at 9:57 AM, Eric Dumazet wrote:
>
> Your patch considers TASKLET_SOFTIRQ being a candidate for 'immediate
> handling', but TCP Small queues heavily use TASKLET,
> so as far as I am concerned a revert would have the same effect.
Does it actually?
TCP ends up dropping packets o
On Tue, Jan 9, 2018 at 9:48 AM, Linus Torvalds
wrote:
> On Tue, Jan 9, 2018 at 9:27 AM, Eric Dumazet wrote:
>>
>> So yes, commit 4cd13c21b207 ("softirq: Let ksoftirqd do its job") has
>> shown up multiple times in various 'regressions'
>> simply because it could surface the problem more often.
>>
On Tue, Jan 9, 2018 at 9:42 AM, Mauro Carvalho Chehab
wrote:
>
> On my preliminar tests, writing to a file on an ext4 partition at a
> USB stick loses data up to the point to make it useless (1/4 of the data
> is lost!). However, writing to a class 10 microSD card is doable.
Note that most USB st
On Tue, Jan 9, 2018 at 9:27 AM, Eric Dumazet wrote:
>
> So yes, commit 4cd13c21b207 ("softirq: Let ksoftirqd do its job") has
> shown up multiple times in various 'regressions'
> simply because it could surface the problem more often.
> But even if you revert it, you can still make the faulty
> dr
Em Mon, 8 Jan 2018 11:51:04 -0800
Linus Torvalds escreveu:
> On Mon, Jan 8, 2018 at 11:15 AM, Alan Stern wrote:
> >
> > Both dwc2_hsotg and ehci-hcd use the tasklets embedded in the
> > giveback_urb_bh member of struct usb_hcd. See usb_hcd_giveback_urb()
> > in drivers/usb/core/hcd.c; the calls
On Tue, Jan 9, 2018 at 8:51 AM, Josef Griebichler
wrote:
> Hi Linus,
>
> your patch works very good for me and others (please see
> https://forum.libreelec.tv/thread/4235-dvb-issue-since-le-switched-to-kernel-4-9-x/?postID=77006#post77006).
> No errors in recordings any more.
> The patch was als
iebichler" , "Mauro Carvalho Chehab"
, "Alan Stern" , "Greg
Kroah-Hartman" , linux-...@vger.kernel.org, "Eric
Dumazet" , "Rik van Riel" , "Paolo Abeni"
, "Hannes Frederic Sowa" , linux-kernel
, netdev , "Jonathan
Corb
On Mon, 8 Jan 2018 22:44:27 +0100
Peter Zijlstra 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 U
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
On Mon, 8 Jan 2018 17:26:10 +0100
"Josef Griebichler" wrote:
> I tried your mentioned patch but unfortunately no real improvement for me.
> dmesg http://ix.io/DOg
> tvheadend service log http://ix.io/DOi
>
> Errors during recording are still there.
Are you _also_ recording the stream on the Ras
On Mon, 8 Jan 2018 12:35:08 -0500 (EST) Alan Stern
wrote:
> On Mon, 8 Jan 2018, Josef Griebichler wrote:
>
> > No I can't sorry. There's no sat connection near to my workstation.
>
> Can we ask the person who made this post:
> https://forum.libreelec.tv/thread/4235-dvb-issue-since-le-switc
On Mon, Jan 8, 2018 at 11:15 AM, Alan Stern wrote:
>
> Both dwc2_hsotg and ehci-hcd use the tasklets embedded in the
> giveback_urb_bh member of struct usb_hcd. See usb_hcd_giveback_urb()
> in drivers/usb/core/hcd.c; the calls are
>
> else if (high_prio_bh)
> tasklet_hi_sc
On Mon, 8 Jan 2018, Linus Torvalds wrote:
> Can somebody tell which softirq it is that dvb/usb cares about?
I don't know about the DVB part. The USB part is a little difficult to
analyze, mostly because the bug reports I've seen are mostly from
people running non-vanilla kernels. For example, J
On Mon, Jan 8, 2018 at 9:55 AM, Ingo Molnar wrote:
>
> as I doubt we have enough time to root-case this properly.
Well, it's not like this is a new issue, and we don't have to get it
fixed for 4.15. It's been around since 4.9, it's not a "have to
suddenly fix it this week" issue.
I just think th
* Linus Torvalds wrote:
> On Sat, Jan 6, 2018 at 11:54 AM, Mauro Carvalho Chehab
> wrote:
> >
> > Em Sat, 6 Jan 2018 16:04:16 +0100
> > "Josef Griebichler" escreveu:
> >>
> >> the causing commit has been identified.
> >> After reverting commit
> >> https://git.kernel.org/pub/scm/linux/kernel/
org, "Eric Dumazet"
> , "Rik van Riel" , "Paolo Abeni"
> , "Hannes Frederic Sowa" , "Jesper
> Dangaard Brouer" , linux-kernel
> , netdev , "Jonathan
> Corbet" , LMML , "Peter
> Zijlstra" , "David Miller
g, "Eric Dumazet"
, "Rik van Riel" , "Paolo Abeni"
, "Hannes Frederic Sowa" , "Jesper
Dangaard Brouer" , linux-kernel
, netdev , "Jonathan
Corbet" , LMML , "Peter Zijlstra"
, "David Miller" ,
torva...@linux-foundation
On Mon, 8 Jan 2018, Josef Griebichler wrote:
> Hi Maro,
>
> I tried your mentioned patch but unfortunately no real improvement for me.
> dmesg http://ix.io/DOg
> tvheadend service log http://ix.io/DOi
> Errors during recording are still there.
> Errors increase if there is additional tcp load on
Hi Maro,
I tried your mentioned patch but unfortunately no real improvement for me.
dmesg http://ix.io/DOg
tvheadend service log http://ix.io/DOi
Errors during recording are still there.
Errors increase if there is additional tcp load on raspberry.
Unfortunately there's no usbmon or tshark on lib
On Mon, 8 Jan 2018, Mauro Carvalho Chehab wrote:
> > Let find the root-cause of this before reverting, as this will hurt the
> > networking use-case.
> >
> > I want to see if the increase buffer will solve the issue (the current
> > buffer of 0.63 ms seem too small).
>
> For TV, high latency has
On Mon, 8 Jan 2018, Mauro Carvalho Chehab wrote:
> Em Sun, 7 Jan 2018 10:41:37 -0500 (EST)
> Alan Stern escreveu:
>
> > On Sun, 7 Jan 2018, Mauro Carvalho Chehab wrote:
> >
> > > > > It seems that the original patch were designed to solve some IRQ
> > > > > issues
> > > > > with network cards
Em Mon, 8 Jan 2018 12:59:10 +0100
Jesper Dangaard Brouer escreveu:
> On Mon, 8 Jan 2018 08:02:00 -0200
> Mauro Carvalho Chehab wrote:
>
> > Hi Linus,
> >
> > Em Sun, 7 Jan 2018 13:23:39 -0800
> > Linus Torvalds escreveu:
> >
> > > On Sat, Jan 6, 2018 at 11:54 AM, Mauro Carvalho Chehab
> >
On Mon, 8 Jan 2018 08:02:00 -0200
Mauro Carvalho Chehab wrote:
> Hi Linus,
>
> Em Sun, 7 Jan 2018 13:23:39 -0800
> Linus Torvalds escreveu:
>
> > On Sat, Jan 6, 2018 at 11:54 AM, Mauro Carvalho Chehab
> > wrote:
> > >
> > > Em Sat, 6 Jan 2018 16:04:16 +0100
> > > "Josef Griebichler" escrev
Hi Linus,
Em Sun, 7 Jan 2018 13:23:39 -0800
Linus Torvalds escreveu:
> On Sat, Jan 6, 2018 at 11:54 AM, Mauro Carvalho Chehab
> wrote:
> >
> > Em Sat, 6 Jan 2018 16:04:16 +0100
> > "Josef Griebichler" escreveu:
> >>
> >> the causing commit has been identified.
> >> After reverting commit
>
Em Sun, 7 Jan 2018 10:41:37 -0500 (EST)
Alan Stern escreveu:
> On Sun, 7 Jan 2018, Mauro Carvalho Chehab wrote:
>
> > > > It seems that the original patch were designed to solve some IRQ issues
> > > > with network cards with causes data losses on high traffic. However,
> > > > it is also causin
On Sat, Jan 6, 2018 at 11:54 AM, Mauro Carvalho Chehab
wrote:
>
> Em Sat, 6 Jan 2018 16:04:16 +0100
> "Josef Griebichler" escreveu:
>>
>> the causing commit has been identified.
>> After reverting commit
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4cd13c21b20
linux-...@vger.kernel.org, "Eric Dumazet"
, "Rik van Riel" , "Paolo Abeni"
, "Hannes Frederic Sowa" , "Jesper
Dangaard Brouer" , linux-kernel
, netdev , "Jonathan
Corbet" , LMML , "Peter Zijlstra"
, "David Miller"
On Sun, 7 Jan 2018, Mauro Carvalho Chehab wrote:
> > > It seems that the original patch were designed to solve some IRQ issues
> > > with network cards with causes data losses on high traffic. However,
> > > it is also causing bad effects on sustained high bandwidth demands
> > > required by DVB c
Em Sat, 6 Jan 2018 16:44:20 -0500 (EST)
Alan Stern escreveu:
> On Sat, 6 Jan 2018, Mauro Carvalho Chehab wrote:
>
> > Hi Josef,
> >
> > Em Sat, 6 Jan 2018 16:04:16 +0100
> > "Josef Griebichler" escreveu:
> >
> > > Hi,
> > >
> > > the causing commit has been identified.
> > > After revertin
On Sat, 6 Jan 2018, Mauro Carvalho Chehab wrote:
> Hi Josef,
>
> Em Sat, 6 Jan 2018 16:04:16 +0100
> "Josef Griebichler" escreveu:
>
> > Hi,
> >
> > the causing commit has been identified.
> > After reverting commit
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit
> Cc: "Josef Griebichler" , lcaumo...@gmail.com,
> gre...@linuxfoundation.org, linux-me...@vger.kernel.org,
> linux-...@vger.kernel.org
> Betreff: Re: dvb usb issues since kernel 4.9
> Em Sun, 17 Dec 2017 12:06:37 +
> Sean Young escreveu:
>
> > Hi Josef,
>
&g
deas about how to fix it without causing regressions to
network?
Regards,
Mauro
> Gesendet: Sonntag, 17. Dezember 2017 um 14:27 Uhr
> Von: "Mauro Carvalho Chehab"
> An: "Sean Young"
> Cc: "Josef Griebichler" , lcaumo...@gmail.com,
> gre...@linuxfou
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