[HAIFUX LECTURE] VSwapper, a guest-agnostic memory swapper for virtual environments -- Nadav Amit
eli at billauer.co.il
Sat Apr 26 19:59:05 IDT 2014
On Monday, April 28th at 18:30, Haifux will gather to hear a talk by
VSwapper, a guest-agnostic memory swapper for virtual environments
The number of guest virtual machines that can be consolidated on one
physical host is typically limited by the memory size, motivating memory
overcommitment. Guests are given a choice to either install a "balloon"
driver to coordinate the overcommitment activity, or to experience
degraded performance due to uncooperative swapping. Ballooning, however,
is not a complete solution, as hosts must still fall back on
uncooperative swapping in various circumstances. Additionally,
ballooning takes time to accommodate change, and so guests might
experience degraded performance under changing conditions.
Our goal is to improve the performance of hosts when they fall back on
uncooperative swapping and/or operate under changing load conditions. We
carefully isolate and characterize the causes for the associated poor
performance, which include various types of superfluous swap operations,
decayed swap file sequentiality, and ineffective prefetch decisions upon
page faults. We address these problems by implementing VSwapper, a
guest-agnostic memory swapper for virtual environments that allows
efficient, uncooperative overcommitment. With inactive ballooning,
VSwapper yields up to an order of magnitude performance improvement.
Combined with ballooning, VSwapper can achieve up to double the
performance under changing load conditions.
We meet in Taub building, room 6. For instructions see:
Attendance is free, and you are all invited!
There are no scheduled lectures.
We are always interested in hearing your talks and ideas. If you wish to
give a talk, hold a discussion, or just plan some event haifux might be
interested in, please contact us at webmaster at haifux.org
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