From: Joerg Roedel
When the crashkernel is loaded above 4GiB in memory the
first kernel only allocates 72MiB of low-memory for the DMA
requirements of the second kernel. On systems with many
devices this is not enough and causes device driver
initialization errors and failed crash dumps. Testing
On 02/13/15 at 11:28pm, Joerg Roedel wrote:
> Hi Baoquan,
>
> On Fri, Feb 13, 2015 at 11:34:38PM +0800, Baoquan He wrote:
> > Conclusively, I like 256M since the testing data showed it's sufficient
> > now and should be save for a long time.
>
> Thanks, I am fine with 256MB too, so can I have you
Hi Baoquan,
On Fri, Feb 13, 2015 at 11:34:38PM +0800, Baoquan He wrote:
> Conclusively, I like 256M since the testing data showed it's sufficient
> now and should be save for a long time.
Thanks, I am fine with 256MB too, so can I have your Acked-by on this
series? I will rebase and resend it the
On 02/09/15 at 01:20pm, Joerg Roedel wrote:
> Hi Baoquan,
>
> On Wed, Feb 04, 2015 at 03:10:20PM +0100, Joerg Roedel wrote:
> > That makes sense. I also asked the customer to test intermediate values,
> > we already know that it works with 256MB but also that 128MB are not
> > enough. I will repor
Hi Baoquan,
On Wed, Feb 04, 2015 at 03:10:20PM +0100, Joerg Roedel wrote:
> That makes sense. I also asked the customer to test intermediate values,
> we already know that it works with 256MB but also that 128MB are not
> enough. I will report back when I have the results of the intermediate
> val
Hi Baoquan,
On Sun, Feb 01, 2015 at 04:41:03PM +0800, Baoquan He wrote:
> Before I said 256M may not be a good value, that's because in your patch
> cover you said this number comes from experiments on the affected
> systems, and 128M was still not enough, then you set it to 256M. This
> may be a
On 01/26/15 at 01:07pm, Joerg Roedel wrote:
> Hi Baoquan,
>
> thanks for your reply.
>
> On Fri, Jan 23, 2015 at 04:44:53PM +0800, Baoquan He wrote:
> > 2) increase low-mem when crashkernel=high. But we have to be careful to
> > do this. We implement crashkernel=high not only for the unhappiness
On Mon, Jan 26, 2015 at 01:40:06PM +0100, Joerg Roedel wrote:
> Yes. Given that we have no data about what would work on most
> systems, we can only change the value to a number that fixes know
> problems and then act on possible regressions caused by the change (and
> that change is pretty easy to
On Mon, Jan 26, 2015 at 01:20:17PM +0100, Borislav Petkov wrote:
> On Mon, Jan 26, 2015 at 01:11:42PM +0100, Joerg Roedel wrote:
> > Or we solve it in user-space by some more cleverness in creating the
> > kernel command-line for crashkernel=high.
>
> I'd say, we should try to do as much as possib
On Mon, Jan 26, 2015 at 01:11:42PM +0100, Joerg Roedel wrote:
> Well, there is no easy way. But we could collect information from the
> loaded drivers on boot about how many dma-memory they allocate and base
> our allocation on that.
That sounds like a nifty idea to me.
> Or we solve it in user-s
On Fri, Jan 23, 2015 at 06:02:43PM +0100, Borislav Petkov wrote:
> On Tue, Jan 06, 2015 at 03:51:14PM +0100, Joerg Roedel wrote:
> > From: Joerg Roedel
> >
> > When the crashkernel is loaded above 4GiB in memory the
> > first kernel only allocates 72MiB of low-memory for the DMA
> > requirements
Hi Baoquan,
thanks for your reply.
On Fri, Jan 23, 2015 at 04:44:53PM +0800, Baoquan He wrote:
> 2) increase low-mem when crashkernel=high. But we have to be careful to
> do this. We implement crashkernel=high not only for the unhappiness
> crashkernel reservation is limited below 4G, but dma/dma
On Tue, Jan 06, 2015 at 03:51:14PM +0100, Joerg Roedel wrote:
> From: Joerg Roedel
>
> When the crashkernel is loaded above 4GiB in memory the
> first kernel only allocates 72MiB of low-memory for the DMA
> requirements of the second kernel. On systems with many
> devices this is not enough and c
Hi Joerg,
Yeah, it does happen if too many devices. I guess the reason no reports
come to us on rhel is we always use a auto mechsanism. We always try to
allocate from below 896M, if failed try below 4G, if failed try above
4G.
This could be solved in 2 ways:
1) We could optimize the distro shel
From: Joerg Roedel
When the crashkernel is loaded above 4GiB in memory the
first kernel only allocates 72MiB of low-memory for the DMA
requirements of the second kernel. On systems with many
devices this is not enough and causes device driver
initialization errors and failed crash dumps. Set this
From: Joerg Roedel
When the crashkernel is loaded above 4GiB in memory the
first kernel only allocates 72MiB of low-memory for the DMA
requirements of the second kernel. On systems with many
devices this is not enough and causes device driver
initialization errors and failed crash dumps. Set this
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