From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: Aw: Re: dvb usb issues since kernel 4.9 From: Mauro Carvalho Chehab Message-Id: <20180113070920.4453eafe@vento.lan> Date: Sat, 13 Jan 2018 07:09:20 -0200 To: Eric Dumazet Cc: Linus Torvalds , Eric Dumazet , Josef Griebichler , Jesper Dangaard Brouer , Peter Zijlstra , Alan Stern , Greg Kroah-Hartman , USB list , Rik van Riel , Paolo Abeni , Hannes Frederic Sowa , linux-kernel , netdev , Jonathan Corbet , LMML , David Miller , Arnd Bergmann List-ID: RW0gRnJpLCAxMiBKYW4gMjAxOCAxMzo0ODo0NiAtMDgwMApFcmljIER1bWF6ZXQgPGVyaWMuZHVt YXpldEBnbWFpbC5jb20+IGVzY3JldmV1OgoKPiBPbiBGcmksIDIwMTgtMDEtMTIgYXQgMTk6MTMg LTAyMDAsIE1hdXJvIENhcnZhbGhvIENoZWhhYiB3cm90ZToKPiA+IAo+ID4gCj4gPiBUaGUgLmNv bmZpZyBmaWxlIHVzZWQgdG8gYnVpbGQgdGhlIEtlcm5lbCBpcyBhdDoKPiA+IAlodHRwczovL3Bh c3RlYmluLmNvbS93cFpnaGFubgo+ID4gCj4gCj4gSGkgTWF1cm8KPiAKPiBBbnkgY2hhbmNlIHlv dSBjYW4gdHJ5IENPTkZJR19IWl8xMDAwPXksIENPTkZJR19IWj0xMDAwwqA/CgpJIGNhbiBkbyBz dWNoIHRlc3QgdG8gc2F0aXNmeSB5b3VyIGN1cmlvc2l0eSwgYnV0IHRoYXQgZG9lc24ndCBzb3Vu ZCB0aGUgcmlnaHQKZml4LgoKU2VlLCBhbG1vc3QgYWxsIFRWIGFuZCBzZXQgdG9wIGJveGVzKFNU QikgcnVuIExpbnV4IG5vd2FkYXlzIGFuZCB1c3VhbGx5IGNvbWUKd2l0aCBBUk0gY3B1cyBkZXNp Z25lZCB0byAianVzdCBkbyB0aGVpciBqb2IiIChlLiBnLiBDUFVzIHdpdGggbG93IGNsb2Nrcyku IApUaGVyZSwgcG93ZXIgY29uc3VtcHRpb24gaXMgYSBtdXN0LiBUaGlzIGJ1ZyB2ZXJ5IGxpa2Vs eSBhZmZlY3QgdGhvc2UgZGV2aWNlcywKb25jZSBtaWdyYXRlZCB0byBLZXJuZWwgNC45Ky4gQ2hh bmdpbmcgZnJvbSBOT19IWiB0byBIWj0xMDAwIG9uIFRWL1NUQiB3aWxsCmZvciBzdXJlIGhhdmUg YmFkIHNpZGUgZWZmZWN0cyBvbiB0aG9zZSB0eXBlcyBvZiBkZXZpY2VzLCBpbmNyZWFzaW5nIHBv d2VyCmNvbnN1bXB0aW9uLgoKTm90IHNheWluZyB0aGF0IHRoaXMgd2lsbCBiZSBlbnZpcm9ubWVu dGFsbHkgdmVyeSBiYWQsIGFzIHRoZSBudW1iZXIgb2YganVzdApUViB1bml0IHNhbGVzIGlzIGF0 IHRoZSBvcmRlciBvZiAyMzAgbWlsbGlvbiB1bml0cyBwZXIgeWVhclsxXS4KClsxXSBodHRwczov L3d3dy5zdGF0aXN0YS5jb20vc3RhdGlzdGljcy80NjEzMTYvZ2xvYmFsLXR2LXVuaXQtc2FsZXMv CgoKVGhhbmtzLApNYXVybwotLS0KVG8gdW5zdWJzY3JpYmUgZnJvbSB0aGlzIGxpc3Q6IHNlbmQg dGhlIGxpbmUgInVuc3Vic2NyaWJlIGxpbnV4LXVzYiIgaW4KdGhlIGJvZHkgb2YgYSBtZXNzYWdl IHRvIG1ham9yZG9tb0B2Z2VyLmtlcm5lbC5vcmcKTW9yZSBtYWpvcmRvbW8gaW5mbyBhdCAgaHR0 cDovL3ZnZXIua2VybmVsLm9yZy9tYWpvcmRvbW8taW5mby5odG1sCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from osg.samsung.com ([64.30.133.232]:42364 "EHLO osg.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754593AbeAMJJd (ORCPT ); Sat, 13 Jan 2018 04:09:33 -0500 Date: Sat, 13 Jan 2018 07:09:20 -0200 From: Mauro Carvalho Chehab To: Eric Dumazet Cc: Linus Torvalds , Eric Dumazet , Josef Griebichler , Jesper Dangaard Brouer , Peter Zijlstra , Alan Stern , Greg Kroah-Hartman , USB list , Rik van Riel , Paolo Abeni , Hannes Frederic Sowa , linux-kernel , netdev , Jonathan Corbet , LMML , David Miller , Arnd Bergmann Subject: Re: dvb usb issues since kernel 4.9 Message-ID: <20180113070920.4453eafe@vento.lan> In-Reply-To: <1515793726.3606.1.camel@gmail.com> References: <20180107090336.03826df2@vento.lan> <20180108074324.3c153189@vento.lan> <20180108223109.66c91554@redhat.com> <20180108214427.GT29822@worktop.programming.kicks-ass.net> <20180108231656.3bbd1968@redhat.com> <20180112191343.3083b70e@vento.lan> <1515793726.3606.1.camel@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-media-owner@vger.kernel.org List-ID: 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_HZ=1000 ? I can do such test to satisfy your curiosity, but that doesn't sound the right fix. See, almost all TV and set top boxes(STB) run Linux nowadays and usually come with ARM cpus designed to "just do their job" (e. g. CPUs with low clocks). There, power consumption is a must. This bug very likely affect those devices, once migrated to Kernel 4.9+. Changing from NO_HZ to HZ=1000 on TV/STB will for sure have bad side effects on those types of devices, increasing power consumption. Not saying that this will be environmentally very bad, as the number of just TV unit sales is at the order of 230 million units per year[1]. [1] https://www.statista.com/statistics/461316/global-tv-unit-sales/ Thanks, Mauro