lkml.org 
[lkml]   [2015]   [Jan]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 0/3 v2] Fix kdump failures with crashkernel=high
Adding some more people to CC.

On Tue, Jan 06, 2015 at 03:51:11PM +0100, Joerg Roedel wrote:
> v1->v2:
>
> * Updated comments based on feedback from Konrad
> * Added Acked-bys
> * Rebased to v3.19-rc3
>
> Hi,
>
> here is a patch-set to fix failed kdump kernel boots when
> the systems was booted with crashkernel=X,high. On those
> systems the kernel allocates only 72MiB of low-memory for
> DMA buffers, which showed to be too low on some systems.
>
> The problem is that 64MiB of the low-memory is allocated by
> swiotlb, leaving 8MB for the page-allocator. But swiotlb
> tries to allocate DMA memory from the page-allocator first,
> which fails pretty fast in the boot sequence, causing
> warnings. This patch-set removes these warnings.
>
> But even the 64MiB for swiotlb are eaten up on some systems,
> so that the default of low-memory allocated for the
> crash-kernel is increase from 72MB to 256MB (only changing
> the defaults, can still be overwritten by crashkernel=X,low).
>
> This number comes from experiments on the affected systems,
> 128MiB low-memory was still not enough there, thus I set the
> value to 256MiB to fix the issues.
>
> Any feedback appreciated.
>
> Thanks,
>
> Joerg
>
> Joerg Roedel (3):
> swiotlb: Warn on allocation failure in swiotlb_alloc_coherent
> x86, swiotlb: Try coherent allocations with __GFP_NOWARN
> x86, crash: Allocate enough low-mem when crashkernel=high
>
> arch/x86/kernel/pci-swiotlb.c | 8 ++++++++
> arch/x86/kernel/setup.c | 5 ++++-
> lib/swiotlb.c | 11 +++++++++--
> 3 files changed, 21 insertions(+), 3 deletions(-)
>
> --
> 1.9.1
>
> Joerg Roedel (3):
> swiotlb: Warn on allocation failure in swiotlb_alloc_coherent
> x86, swiotlb: Try coherent allocations with __GFP_NOWARN
> x86, crash: Allocate enough low-mem when crashkernel=high
>
> arch/x86/kernel/pci-swiotlb.c | 8 ++++++++
> arch/x86/kernel/setup.c | 5 ++++-
> lib/swiotlb.c | 11 +++++++++--
> 3 files changed, 21 insertions(+), 3 deletions(-)
>
> --
> 1.9.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>
>

--
Regards/Gruss,
Boris.

ECO tip #101: Trim your mails when you reply.
--


\
 
 \ /
  Last update: 2015-01-19 20:41    [W:0.088 / U:6.600 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site