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Re: [Xen-devel] [OSSTEST PATCH 6/6] builds: Run i386 builds on amd64 kernels
- To: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Thu, 25 Apr 2019 20:44:05 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>
- Delivery-date: Thu, 25 Apr 2019 18:44:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 25/04/2019 17:50, Ian Jackson wrote:
> Most hardware that supports i386 supports amd64 too. When doing
> builds we do need the right userland, but we don't actually care what
> the kernel is doing. With Linux 32-on-64 is good for that.
>
> Especially, there is a kernel regression (evident in the Debian
> stretch kernel, but not present in jessie's) where 32-bit Linux
> mismanages the memory on hosts with moderately large amounts of
> RAM (ie, significantly more RAM than can be addressed at once),
> resulting in what amounts to a near-stall of the paging system. Since
> the paging system is used for filesystem writes too, the effect is
> that commands run by builds can take totally unreasonable amounts of
> time. Ie, this version of Linux is broken when i386 PAE is needed.
>
> In practice this is causing significant trouble in the Xen Project CI.
>
> This kernel bug probably won't affect our test jobs because
> (i) we use our own kernels, so we would probably detect this
> regression when switching kernel branches etc. (ii) test jobs
> run with a dom0_mem setting which avoids the preconditions for the
> particular bug.
>
> CC: Juergen Gross <jgross@xxxxxxxx>
> CC: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
> CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> CC: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Acked-by: Juergen Gross <jgross@xxxxxxxx>
Juergen
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