On Thu, 15 Sep 2005, Dotan Barak wrote:
> Hi.
>
> i try to register 2 types of memory buffers with local write permission
> enabled:
> if the memory was declared as: const char ptr{5}; ,
> then the registration can be done
>
> if the memory was declared as: const char *ptr = "somthing ";
> then the registration fails.
>
> what is the difference between the 2 memory buffers?
I'm not sure what your problem is, but I'll make this observation:
Since buffer #1 is not initialized and buffer #2 is initialized, they
will be located in different parts of the process address space.
Buffer #1 will go into the bss and #2 will go into the data area. It
may be that buffer #2 is placed on a read only page.
What is the error you receive?
Why are you requesting local write permission on buffers you have
declared const, ie. read only?
> should the MR registration verbs handle both of the buffers as read only
> memory buffers?
If you request local write permission, I believe the MR registration
will attempt to set that up. If it finds that the memory is not
writable, I would expect an error.
_______________________________________________
openib-general mailing list
[email protected]
http://openib.org/mailman/listinfo/openib-general
To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
