Re: [Xen-ia64-devel] RE: [Xen-devel] Help? Red Hat fails, Suse/Debian both work fine

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 2 Mar 2006, at 18:56, Alex Williamson wrote:

>   If I dump the xsd_kva page using mmap from another app, there are a
> few entries made:
>
> 0000: 01 00 00 00 00 00 00 00 00 00 00 00 07 00 00 00
> 0010: 64 65 76 69 63 65 00 00 00 00 00 00 00 00 00 00
> 0020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ...
> 0400: 10 00 00 00 00 00 00 00 00 00 00 00 07 00 00 00
> 0410: 45 4e 4f 45 4e 54 00 00 00 00 00 00 00 00 00 00
> 0420: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ...
> 0800: 17 00 00 00 17 00 00 00 00 00 00 00 17 00 00 00
>
> As you indicate, lots of output in the xenstored-trace file, but hardly
> anything here.  We are getting some transactions in there though, so
> maybe we're dealing with a memory ordering issue.  Thanks,

There could be stuff in the page because the kernel has written 
requests there, but it doesn't necessarily mean they have been picked 
up by xenstored. Occam's razor says this page is not mapped properly 
into xenstored's address space: I think it's desperately unlikely to be 
something as subtle as memory ordering. As Ewan noted, any xenstore 
activity is probably driven by clients connected via a unix domain 
socket, not via domain0's xenbus page.

 -- Keir


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