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Re: [Xen-users] CoW works on Windows guest?

From: "Orathai Sukwong" <kobkob@xxxxxxxxx>

Date: Fri, 29 Sep 2006 12:54:50 -0400

Delivery-date: Fri, 29 Sep 2006 09:55:30 -0700

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List-id: Xen user discussion <xen-users.lists.xensource.com>

It would help (a little bit) to know the value and type of i, and the declaration of the dscow struct...

uint32_t i;

struct dscow {
        struct dscow_disk_header header;

        uint64_t blocks;
        uint32_t *bitmap;
        uint32_t bitmap_count;
        uint32_t *dirty_bitmaps;
        char *base_filename;

        int fd;
       int dirty;
};

That's not to say that it's possible from this to determine what the correct values should be or something, but at least it would help a little bit. The fact that it fails at 2.1GB tends to indicate that it's a 2^31 byte boundary problem, which could potentially be fixed with using unsigned rather than signed integer [give you 4GB].

I've tried several scenarioes:

2048000000 bytes (2.0 GB) works fine.
3221225472 bytes (3.2 GB) gave me seg fault.

4096000000 bytes (4.1 GB) gave me seg fault again.

Is this on a 32- or 64-bit system?

My hardware is capable of 64 bit. However, I'm running 32 bit ubuntu 6.06 Dapper.

--

Mats

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