Revision: 7b96835c03fe
Author: riba <[email protected]>
Date: Wed Sep 17 14:32:23 2014 UTC
Log: Edited wiki page PerformanceTuning through web user interface.
https://code.google.com/p/ganeti/source/detail?r=7b96835c03fe&repo=wiki
Modified:
/PerformanceTuning.wiki
=======================================
--- /PerformanceTuning.wiki Tue Sep 9 11:15:49 2014 UTC
+++ /PerformanceTuning.wiki Wed Sep 17 14:32:23 2014 UTC
@@ -21,6 +21,31 @@
}}}
In case that your cluster has nodes with different CPUs, note that a live
migration between two different CPU types could crash the instance. Ganeti
will not warn you about this at the moment, so you will have to handle the
migrations between such nodes yourself. Although Ganeti could provide
support for this in the future, it does not at the moment. See issue <a
href="https://code.google.com/p/ganeti/issues/detail?id=895";>895</a>.
+
+== KSM ==
+
+KSM periodically merges same memory pages, increasing the amount of
available memory. While Ganeti does not explicitly support KSM or account
for memory oversubscription, KSM can be used to relieve memory pressure.
+
+To activate:
+
+{{{
+echo 1 > /sys/kernel/mm/ksm/run
+echo 100 > /sys/kernel/mm/ksm/sleep_millisecs
+}}}
+
+To check status:
+
+{{{
+grep "" /sys/kernel/mm/ksm/*
+> /sys/kernel/mm/ksm/full_scans:203
+> /sys/kernel/mm/ksm/pages_shared:769324
+> /sys/kernel/mm/ksm/pages_sharing:1510361
+> /sys/kernel/mm/ksm/pages_to_scan:100
+> /sys/kernel/mm/ksm/pages_unshared:4712835
+> /sys/kernel/mm/ksm/pages_volatile:602177
+> /sys/kernel/mm/ksm/run:1
+> /sys/kernel/mm/ksm/sleep_millisecs:20
+}}}
= DRBD =
See also Issue 57
--
---
You received this message because you are subscribed to the Google Groups "ganeti-commits" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
