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virsh: Enhance documentation of --rdma-pin-all option

Browse Source 
https://bugzilla.redhat.com/show_bug.cgi?id=1373783

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
This commit is contained in:
Jiri Denemark 2017-09-08 21:31:29 +02:00
parent 11b0e889b5
commit 440838472d
1 changed files with 7 additions and 1 deletions
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@ -1767,7 +1767,13 @@ periodically increased by I<auto-converge-increment>.
I<--rdma-pin-all> can be used with RDMA migration (i.e., when I<migrateuri>
starts with rdma://) to tell the hypervisor to pin all domain's memory at once
before migration starts rather than letting it pin memory pages as needed.
before migration starts rather than letting it pin memory pages as needed. For
QEMU/KVM this requires hard_limit memory tuning element (in the domain XML) to
be used and set to the maximum memory configured for the domain plus any memory
consumed by the QEMU process itself. Beware of setting the memory limit too
high (and thus allowing the domain to lock most of the host's memory). Doing so
may be dangerous to both the domain and the host itself since the host's kernel
may run out of memory.
B<Note>: Individual hypervisors usually do not support all possible types of
migration. For example, QEMU does not support direct migration.