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xen-devel
RE: [Xen-devel] HVM domain with write caching going on somewheretodisk
More testing... there is one write done by windows via the BIOS
interface on boot, and that is to sector 2958215 on my system. By using
dd, I only finally see the results of that write after I have flushed
out the page cache by doing a few big file transfers. That is even after
I got O_DIRECT working...
Something strange is going on I think.
James
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of James Harper
> Sent: Friday, 9 November 2007 12:17
> To: Keir Fraser; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] HVM domain with write caching going on
> somewheretodisk
>
> >
> > I just changed the open in block.c to include O_DIRECT, but it fails
> to
> > boot. The VNC session flashes up very quickly and I can definitely
see
> > the BIOS there but nothing else.
> >
> > I'll have a look a bit further tomorrow...
> >
>
> The reason it was failing was that O_DIRECT requires the buffer to the
> read() and write() function to be page aligned. I have put some bounce
> buffer code into raw_read() and raw_write() in block.c, which does
this
> (very inefficiently of course), and still get the same error, so maybe
> this isn't the problem after all...
>
> Any other suggestions?
>
> Thanks
>
> James
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
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