Re: [Xen-ia64-devel] [PATCH] work around for populate physmap hypercall

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

Thank you very much for testing/experimenting.
Attached the updated patch.
Only the constants and comments were changed.


On Mon, Aug 20, 2007 at 09:35:30AM -0600, Alex Williamson wrote:
> On Mon, 2007-08-20 at 12:23 +0900, Isaku Yamahata wrote:
> > Hi.
> > This patch is work around for xencomm and the soft lockup message.
> > However I need help before commit.
> > 
> > - It is necessary to test it before commit with much memory.
> >   I haven't tested it with much memory because my environment doesn't have
> >   such huge memory.
> > - I defined MEMORYOP_MAX_EXTENTS based on the xencomm limitation.
> >   Howver I'm not sure the value is small enough to avoid the soft lockup
> >   message because I couldn't produce the message on my environment.
> >   It is necessary to determine the value with expriments.
> 
> Hi Isaku,
> 
>    The defined MEMORYOP_MAX_EXTENTS is still a bit too big, I get soft
> lockups with large domains.  Further testing shows dividing your
> MEMORYOP_MAX_EXTENTS calculation by 4 gives me nearly 1 million extents,
> and eliminates the soft lockup.  I've tested up to a 90G domain with no
> problems on startup.  Here's the macro I end up with:
> 
> #define MEMORYOP_MAX_EXTENTS                                            \
>                 ((((((PAGE_SIZE - sizeof(struct xencomm_desc)) /        \
>                    sizeof(uint64_t)) - 2) * PAGE_SIZE) /                \
>                   sizeof(*xen_guest_handle(kern_op.extent_start))) / 4)
> 
> Thanks,
> 
>       Alex
> 
> -- 
> Alex Williamson                             HP Open Source & Linux Org.
> 
> 
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> 

-- 
yamahata

Attachment: 188_782a06dcae9f_repeat_memory_reservation_op.patch
Description: Text Data

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