On 04/16/2013 10:20 PM, mrhi...@linux.vnet.ibm.com wrote: > +Experimental: Next, decide if you want dynamic page registration. > +For example, if you have an 8GB RAM virtual machine, but only 1GB > +is in active use, then disabling this feature will cause all 8GB to > +be pinned and resident in memory. This feature mostly affects the > +bulk-phase round of the migration and can be disabled for extremely > +high-performance RDMA hardware using the following command: > + > +QEMU Monitor Command: > +$ migrate_set_capability chunk_register_destination off # enabled by default
This needs updating to match the QMP capability name (or else the HMP command needs some glue logic to map chunk_register_destination into the QMP x-chunk-register-destination as a convenience to the user). > + > +TODO: > +===== > +1. Currently, cgroups swap limits and infinband memory pinning > + are not compatible with each other. We have no plans to unregister > + memory *during* the live migration as the benefit of doing so is not > clear. > +2. Use of the recent /proc/<pid>/pagemap would likely speed up > + the use of KSM and ballooning while using RDMA. > +3. Also, some form of balloon-device usage tracking would also > + help alleviate some issues. Maybe also mention that the protocol will be renamed from -incoming x-rdma:... to -incoming rdma:... when it has been through more testing to stabilize the protocol. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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