> -----Original Message-----
> From: xen-devel-bounces@lists.xensource.com
> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of
> James Pendergrass
> Sent: 03 November 2006 17:19
> To: xen-devel@lists.xensource.com
> Subject: [Xen-devel] Hard 6 Meg limit on shared pages
>
> I''ve been doing some stress testing on how much memory a domain
can
> share (after a HD and a NIC front end).
> It seems that no matter what I set ORDER_GRANT_FRAMES (in
> xen/include/
> asm/grant_table.h) and NR_GRANT_FRAMES
> (in linux-2.6-xen/include/xen/gnttab.h) to, attempting to share 6
> megabytes or more from any one domain causes really terrible
> errors which very quickly corrupt the virtual hard disk (I
> have tried
> allocating up to 32 pages for the grant table and the
> problems persist).
>
> A sample of the error messages generated by the kernel:
> EXT2-fs error (device hda1): ext2_get_inode: unable to read inode
> block - inode=346073, block=688192
> end_request: I/O error, dev hda1, sector 5737616
> end_request: I/O error, dev hda1, sector 5505536
> end_request: I/O error, dev hda1, sector 0
> EXT2-fs error (device hda1): ext2_get_inode: unable to read inode
> block - inode=346073, block=688192
> end_request: I/O error, dev hda1, sector 5737616
> end_request: I/O error, dev hda1, sector 5505536
> end_request: I/O error, dev hda1, sector 0
> EXT2-fs error (device hda1): ext2_get_inode: unable to read inode
> block - inode=346073, block=688192
>
> (sorry I can''t get the first error message generated, it scrolls
by
> too quickly and my terminals buffer fills up)
>
> I''ve tried this on xen-3.0-testing.hg (3.0.2-3), and xen-unstable
> trees with the same results.
>
> I have not managed to find any reason why this should be happening.
> Is this a known issue?
> Is there any additional information I can provide that would help
> track this down?
>
> Thanks
> -aaron
>
I don''t know, but I think it would help if you tried compiling Xen with
"debug=y", to allow any debug code to catch some inconsistency that
occurs...
--
Mats
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