-----Original message----- > From: Pablo Sebastián Greco <pablo at fliagreco.com.ar> > Sent: Thursday, December 17, 2020 9:39 PM > To: mark <mark at havak.nl>; Conversations around CentOS on ARM hardware <arm-dev at centos.org> > Subject: Re: [Arm-dev] unable to configure zram-swap on RPI 4 8G model (32bit) > > > On 17/12/20 14:09, mark wrote: > > -----Original message----- > >> From: mark <mark at havak.nl> > >> Sent: Monday, December 14, 2020 6:15 PM > >> To: Pablo Sebastián Greco <pablo at fliagreco.com.ar>; Conversations around > CentOS on ARM hardware <arm-dev at centos.org> > >> Subject: RE: [Arm-dev] unable to configure zram-swap on RPI 4 8G model > (32bit) > >> > >> > >> > >> -----Original message----- > >>> From: Pablo Sebastián Greco <pablo at fliagreco.com.ar> > >>> Sent: Monday, December 14, 2020 6:00 PM > >>> To: Conversations around CentOS on ARM hardware <arm-dev at centos.org>; > mark > >> <mark at havak.nl> > >>> Subject: Re: [Arm-dev] unable to configure zram-swap on RPI 4 8G model > (32bit) > >>> > >>> > >>> On 14/12/20 13:43, mark wrote: > >>>> -----Original Message----- > >>>> From: Pablo Sebastián Greco <pablo at fliagreco.com.ar> > >>>> Sent: maandag 14 december 2020 17:20 > >>>> To: Conversations around CentOS on ARM hardware <arm-dev at centos.org>; > >> mark > >>> <mark at havak.nl> > >>>> Subject: Re: [Arm-dev] unable to configure zram-swap on RPI 4 8G model > >> (32bit) > >>>> > >>>> On 14/12/20 11:42, mark wrote: > >>>>> Being aware using zram-swap is not a default feature on the CentOS > >>>>> Userland for armv7hl, Still want to share the problem I ran in to. > >>>>> > >>>>> I turns out the arm 32bit kernel with large memory support OOPS if zram-swap > >>> is deployed if the system has more than 4GB ram. > >>>> I'm a heavy user of zram-swap, even not being default, but I have only > >> used > >>> with devices that have 2G max, this is interesting. Does it still happen > >> if > >>> you limit the size? > >>>> Did not test limiting the ram to 4GB myself jet, it does according to > >> : > >>>> https://github.com/raspberrypi/linux/issues/3839#issuecomment-723027652 > >>> I meant limiting the size of the zram-swap > >> No the size of the swap does not seem matter: I tried 512, 1024 and 4096MB > >> > >> On a RPI4 4GB model it works just fine, > >> on a 8GB model I get a "Internal error: Oops: 207" > >> > >> BTW running a fresh homebrew image of CentOS 7.9.2009 without a swap-partition > >> and kernel: > >> 5.4.72-v7l.1.el7 #1 SMP Wed Oct 21 17:20:56 UTC 2020 armv7l armv7l armv7l > >> GNU/Linux > >> > >> > >>>> > >>>>> This issue seems to be addressed (verry recently) in kernel 5.4.81 (1) > >>>>> > >>>>> As mentioned this is verry recently, version 5.4.81 is just 12 day's > >> old.. > >>>>> However if there is a testbuild of this rpi2-kernel4: I'm eager to test > >>> it > > Just a heads-up, > > > > I could not figure out how to make a test build of a kernel => 5.4.81 based > on the current raspberrypi2-kernel4-5.4.72 kernel. > > Not knowledgeable enough to update the rpi-5.4.x.patch... My Bad > > > > However was able to rebuild the current kernel with the patch mentioned > in the commit (1); > > needed to include an other, quite harmless looking, patch in order to get > it applied clean > > That's even better actually, because we can confirm that it actually > that patch that fixes it, thanks!!! > > Just curious, how long did it take to rebuild the kernel? About 01:45; (mock) state.log building on an odroid hc1: 2020-12-17 15:46:56,190 - Mock Version: 2.7 2020-12-17 15:46:58,637 - Start: yum update 2020-12-17 15:47:11,414 - Finish: yum update 2020-12-17 15:47:11,458 - Finish: chroot init 2020-12-17 15:47:11,470 - Start: build phase for raspberrypi2-5.4.72-v7.1.1.ns7.src.rpm 2020-12-17 15:47:11,488 - Start: build setup for raspberrypi2-5.4.72-v7.1.1.ns7.src.rpm 2020-12-17 15:48:41,143 - Finish: build setup for raspberrypi2-5.4.72-v7.1.1.ns7.src.rpm 2020-12-17 15:48:41,147 - Start: Outputting list of installed packages 2020-12-17 15:48:41,842 - Finish: Outputting list of installed packages 2020-12-17 15:48:41,843 - Start: rpmbuild raspberrypi2-5.4.72-v7.1.1.ns7.src.rpm 2020-12-17 17:28:49,731 - Finish: rpmbuild raspberrypi2-5.4.72-v7.1.1.ns7.src.rpm 2020-12-17 17:28:51,856 - Finish: build phase for raspberrypi2-5.4.72-v7.1.1.ns7.src.rpm 2020-12-17 17:28:51,884 - Start: clean chroot 2020-12-17 17:30:32,678 - Finish: clean chroot 2020-12-17 17:30:32,683 - Finish: run probably going to move to a (faster) platform in the future; it is hard to just say goodbye to a device that served you well :) > > > Long story short, zram-swap works on my RPI4 8G model: > > > > # swapon --show > > NAME TYPE SIZE USED PRIO > > /dev/zram0 partition 3.7G 0B -2 > > > > # uname -a > > Linux localhost 5.4.72-v7l.1.1.el7 #1 SMP Thu Dec 17 16:13:03 CET 2020 armv7l > armv7l armv7l GNU/Linux > > > > # free -m > > total used free shared buff/cache available > > Mem: 7876 94 7469 16 312 > 7691 > > Swap: 3755 0 3755 > > > > > > In my (probably short lived) git repo the changes I made: > > https://github.com/markVnl/Centos-raspberrypi2-kernel/tree/zram-swap-oops > > > > > >>>> There's no test build yet, I'm still adjusting to what happened last > >>>> week, but hopefully we'll have a new kernel soon > >>>>> 1) https://github.com/raspberrypi/linux/commit/1bef5f25a69234613b92a0e2456870fee4a57efc > >>>>> > >>>>> > >>>> Pablo. > >>>> > >>>> _______________________________________________ > >>>> Arm-dev mailing list > >>>> Arm-dev at centos.org > >>>> https://lists.centos.org/mailman/listinfo/arm-dev > Pablo. >