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Bug#866314: linux-image-4.9.0-3-686-pae: 100+ times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x

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On Wednesday, 1 June 2022 14:09:28 CEST Holger Levsen wrote:
> On Wed, Jun 01, 2022 at 01:27:32AM +0200, Diederik de Haas wrote:
> > What's the current status wrt this bug?
> 
> we downgraded the memory of our nodes to 8gb to work around the issue...

Andrew Morton said in https://bugzilla.kernel.org/show_bug.cgi?id=196157#c21 :
"People are still hurting from this.  It does seem a pretty major
regression for highmem machines.

I'm surprised that we aren't hearing about this from distros.  Maybe it
only affects a subset of highmem machines?

Anyway, can we please take another look at it?  Seems that we messed up
highmem dirty pagecache handling in the 4.2 timeframe."

I didn't see a mention of this bug in that upstream bug report.

A mention of "the i386 build nodes for tests.reproducible-builds.org" may also 
help to increase the priority for the upstream devs.
And if it's possible to equip one of the machines with 16G again and provide 
access to the upstream devs to that machine, that will likely increase the 
chances that something may happen.

So it would be really helpful if this would be added to the upstream bug 
report. Otherwise it's extremely unlikely anything will change.

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Bug#866314: linux-image-4.9.0-3-686-pae: 100+ times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x Salvatore Bonaccorso <carnil@debian.org> - 2021-05-02 11:50 +0200
  Bug#866314: linux-image-4.9.0-3-686-pae: 100+ times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x Holger Levsen <holger@layer-acht.org> - 2021-05-03 13:40 +0200
    Bug#866314: linux-image-4.9.0-3-686-pae: 100+ times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x Diederik de Haas <didi.debian@cknow.org> - 2022-06-01 01:40 +0200
      Processed: Re: Bug#866314: linux-image-4.9.0-3-686-pae: 100+  times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x "Debian Bug Tracking System" <owner@bugs.debian.org> - 2022-06-01 01:40 +0200
      Bug#866314: linux-image-4.9.0-3-686-pae: 100+ times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x Holger Levsen <holger@layer-acht.org> - 2022-06-01 14:20 +0200
        Bug#866314: linux-image-4.9.0-3-686-pae: 100+ times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x Diederik de Haas <didi.debian@cknow.org> - 2022-06-01 15:00 +0200
          Bug#866314: linux-image-4.9.0-3-686-pae: 100+ times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x Holger Levsen <holger@layer-acht.org> - 2022-06-01 15:20 +0200
            Bug#866314: linux-image-4.9.0-3-686-pae: 100+ times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x Diederik de Haas <didi.debian@cknow.org> - 2022-06-01 16:10 +0200
              Bug#866314: linux-image-4.9.0-3-686-pae: 100+ times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x Holger Levsen <holger@layer-acht.org> - 2022-06-01 16:20 +0200
                Bug#866314: linux-image-4.9.0-3-686-pae: 100+ times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x Diederik de Haas <didi.debian@cknow.org> - 2022-06-01 16:50 +0200
      Bug#866314: linux-image-4.9.0-3-686-pae: 100+ times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x Diederik de Haas <didi.debian@cknow.org> - 2022-12-11 15:10 +0100
        Processed: Re: Bug#866314: linux-image-4.9.0-3-686-pae: 100+  times slower disk writes on 4.x+/i386/16+RAM, compared to 3.x "Debian Bug Tracking System" <owner@bugs.debian.org> - 2022-12-11 15:10 +0100

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