There's a very nice, simple client/server RDMA application on the
internet you can use to test your patch.
http://thegeekinthecorner.wordpress.com/2010/09/28/rdma-read-and-write-with-ib-verbs/
This guy provides the source code which dumps several gigabytes over RDMA
to the other side.
There's no need to run QEMU to test your patch,
assuming you have access to infiniband hardware.
- Michael
On 04/10/2013 01:32 AM, Michael S. Tsirkin wrote:
On Wed, Apr 10, 2013 at 12:32:31AM -0400, Michael R. Hines wrote:
On 04/09/2013 11:24 PM, Michael S. Tsirkin wrote:
Which mechanism do you refer to? You patches still seem to pin
each page in guest memory at some point, which will break all COW.
In particular any pagemap tricks to detect duplicates on source
that I suggested won't work.
Sorry, I mispoke. I'm reffering to dynamic server page registration.
Of course it does not eliminate pinning - but it does mitigate the
foot print of the VM as a feature that was requested.
I have implemented it and documented it.
- Michael
Okay, but GIFT is supposed to be used on send side: it's only allowed
with local/remote read access, and serves to reduce memory usage
on send side.
For example, disable zero page detection and look at memory usage
on send side before and after migration.
Dynamic registration on the receive side is nice but seems
completely unrelated ...
