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Shalini xs10
1.
Supporting Soft Real-Time
Tasks Min Lee, A. S. Krishnakumar, P. Krishnan, Navjot Singh, Shalini Yajnik Paper published in VEE 2010
2.
Problem Statement Given
a mix of workloads how do you schedule the workload such that – Real-time workloads get the needed resources – Non-real-time workloads are not starved Main goal: – Present a new scheduler based on the credit scheduler which meets the demands of a real-time workload – Target application studied: Media in an IP telephony system © 2009 Avaya Inc. All rights reserved. 2
3.
Real-Time Applications Requirements
of a Real-time application like Media Server – Highly I/O bound – Needs timely allocation of compute resources Challenges when deployed on Xen – I/O virtualization overhead – Variable scheduling latency with mixed workloads – Cache contention between workloads Scheduler is central to all these issues! © 2009 Avaya Inc. All rights reserved. 3
4.
Target Application: Enterprise
IP Telephony System Call-C and Sip-S (Call setup/tear down) Gateway/ Media Server (stream IP Endpoint encode/decode) . . . Backbone . . Local Area Network Network . Local Area Network Gateway/ Media Server Media-S Call-C Sip-S Dom0 IP Endpoint Xen Hypervisor Hardware © 2009 Avaya Inc. All rights reserved. 4
5.
Credit Scheduler: Credit
Handling Consumes credits to run CPU0 VCPU4 VCPU2 VCPU7 VCPU1 VCPU0 VCPU5 Under Over priority priority Every 30ms, distribute credits based on weights – E.g. 20% CPU to VM 1, 40% CPU to VM 2 – Proportional distribution – Default weight (256) © 2009 Avaya Inc. All rights reserved. 5
6.
Credit Scheduler: I/O
Handling VCPUs woken up and boosted in priority when event arrives CPU0 VCPU3 VCPU4 VCPU2 VCPU7 VCPU1 VCPU0 VCPU5 Boost Under Over priority priority priority CPU0 VCPU4 VCPU2 VCPU7 VCPU1 VCPU3 VCPU0 VCPU5 Only one time boost (<10ms) © 2009 Avaya Inc. All rights reserved. 6
7.
Credit Scheduler: Credit
Crisis Credits – Good for CPU-bound Compute- task intensive Tasks (supported by Boost Priority credit) – Good for Low-latency tasks, e.g. I/O in Dom0 – Short period boost Media Servers Low-latency Tasks (I/O Multi-media – Need both CPU and low processing, Tasks latency Interactive) (Soft Real-time) – Timely CPU CPU- bound – No support in current scheduler © 2009 Avaya Inc. All rights reserved. 7
8.
Laxity-based Scheduler Four
Components in the scheduler – Laxity (A) – Boost with event (B) – Simple Load Balance (L) – Cache-aware Real-time load balancing (LL) © 2009 Avaya Inc. All rights reserved. 8
9.
Experimental Setup Enterprise Telephony
system – Media server – ‘Media-S’ – Signaling server – ‘Call-C,Sip-S’ – Other VMs • Dom0 • Cdom [Computational domain] • Two more domains [Licensing, management] Two workload scenarios – Standard (Cdom with no load) – Cpuload (Cdom has 4 cpu-bound tasks) © 2009 Avaya Inc. All rights reserved. 9
10.
Experimental Setup
Media-S C-Dom Call-C Dom0 … SIP-S Dell 2950 server – 2 quad-core Xeon processors Xen Hypervisor – 4 GB of RAM Server 4 cores used: 2 cores from each COMPACT socket – So private cache 4cps, sample one out of 4calls IP network IP network – G.711, 20ms packetization – 30sec hold time – Max 240 streams through Media-S tcpdump PESQ – Quality of voice metric SIPp and RTP Clients – Compare the reference with stream from Media-S © 2009 Avaya Inc. All rights reserved. 10
11.
Instrumentation Custom events
for Xentrace CPU utilization Worst/average wait time – Each priority Scheduled Time Average wait time – Each priority Cache misses – By xenoprof L2 cache missesAvaya Inc. All rights reserved. © 2009 11
12.
Reading the plots
PESQ – Quality of voice – 0 (bad)~4.5 – 4.0 (toll quality) Cumulative Density Boxplots – Min/Max – 25%,75% percentile – Median Poor quality Good quality © 2009 Avaya Inc. All rights reserved. 12
13.
Default Credit Scheduler:
Performance Add weights – 512, 1024 – Insignificant impact Pinning – Media-S/Call-C require significant CPU – Pinned Media-S/Call-C to CPU 0,1 respectively – Pinned others to CPU 2,3 – Dom0 is floating – Significant performance gain Weights Pinning – Underutilizing CPU! © 2009 Avaya Inc. All rights reserved. 13
14.
Laxity (A) A
form of priority – Target scheduling latency or deadline – E.g. less than 5ms wait time in the run queue – Parameter specified by user Laxity values for Real-time domains No value specified for Non real-time domains – Conceptually infinite laxity © 2009 Avaya Inc. All rights reserved. 14
15.
Implementation of laxity
Where to insert real-time tasks to meet their deadline – In over priority, laxity value is ignored. VCPU4 VCPU2 VCPU7 VCPU1 VCPU0 VCPU5 CPU0 (1us) (7us) (4us) (13us) (40us) (21us) VCPU# Boost Under Over (Length of priority priority priority previous time slice) 5us 20us 20us&boost © 2009 Avaya Inc. All rights reserved. 15
16.
Prediction of wait
time in runqueue Each VCPU maintains an expected run time – The amount of CPU time it utilized in its previous run Works reasonably well – Min/max – 25%,75% percentile More sophisticated formula can be used Average difference between expected and actual wait times © 2009 Avaya Inc. All rights reserved. 16
17.
Laxity-based Scheduler: Performance
Improved PESQ © 2009 Avaya Inc. All rights reserved. 17
18.
Boost with event
(B) Credit scheduler boosts only waiting VCPUs – Media-S in run queue doesn’t get boosted Idea: Boost a VCPU that receives an event – Even if VCPU with under priority in runqueue VCPU4 VCPU2 VCPU7 VCPU1 VCPU0 VCPU5 CPU0 (1us) (7us) (4us) (13us) (40us) (21us) (1) Receiving event (2) Get boosted within queue VCPU4 VCPU1 VCPU2 VCPU7 VCPU0 VCPU5 CPU0 (1us) (13us) (7us) (4us) (40us) (21us) © 2009 Avaya Inc. All rights reserved. 18
19.
Credit Scheduler: Load
Balance CPU0 VCPU4 VCPU2 VCPU7 VCPU1 VCPU0 VCPU5 (2) Peek peer’s Q (3) Steal higher priority task (1) Over or idle task? CPU1 VCPU10 VCPU15 © 2009 Avaya Inc. All rights reserved. 19
20.
Simple Load Balance
(L) Laxity-based scheduler (Simple Load Balance) CPU0 VCPU4 VCPU2 VCPU7 VCPU1 VCPU0 VCPU5 (2) Peek peer’s Q (3) Steal higher priority task (4) If same priority (a) If mine is real time task, don’t steal (b) If peer’s is real time task, steal (c) Both non-real-time, compare entrance time into queue - with some delay (2ms) (1) Under, over or idle task? CPU1 VCPU17 VCPU11 VCPU10 VCPU15 © 2009 Avaya Inc. All rights reserved. 20
21.
Simple Load Balance
(L) Laxity-based scheduler (Simple Load Balance) CPU0 Media-S VCPU2 VCPU7 VCPU1 VCPU0 VCPU5 (1) This effectively distributes real-time tasks over CPUs (2) Also prevents starvation CPU1 VCPU17 VCPU11 VCPU10 VCPU15 © 2009 Avaya Inc. All rights reserved. 21
22.
Simple Load Balance
(L) Laxity-based scheduler (Simple Load Balance) CPU0 Media-S VCPU2 VCPU7 VCPU1 VCPU0 VCPU5 (1) Moves non-real-time task if they waited for some time CPU1 VCPU2 VCPU17 VCPU11 VCPU10 VCPU15 © 2009 Avaya Inc. All rights reserved. 22
23.
Cache-aware Real-time load
balancing (LL) L good, but… – Ping-ponging tasks trash cache Solution: Bind RT-tasks to CPU – Fix RT-tasks to its initial CPU – Disable load-balancing for RT-tasks Creates unbalance of multiple RT-tasks – Need a new load-balancer for RT-tasks © 2009 Avaya Inc. All rights reserved. 23
24.
Cache-aware Real-time load
balancing (LL) Don’t steal peer’s real-time tasks in L – Prefer hot cache (to low wait time) New x-sec-load balancer – Balance of real time task’s cpu utilization via bin-packing CPU0 90% utilized by one real time task CPU1 80% utilized by three real time tasks © 2009 Avaya Inc. All rights reserved. 24
25.
Cache-aware Real-time load
balancing (LL) Improved PESQ © 2009 Avaya Inc. All rights reserved. 25
26.
Result (CPU utilization)
We’re fully utilizing CPUs! 14000 Amount of work done by cpuhogging 12000 10000 8000 process 6000 4000 2000 0 baseline(pinned) baseline A AL ALL Policies © 2009 Avaya Inc. All rights reserved. 26
27.
Result (Cache misses) Total
cache misses down Cache misses for Media Server down 4000 1200 3500 1000 3000 800 2500 Misses (x10000) 2000 600 1500 400 1000 200 500 0 0 baseline baseline baseline baseline baseline A A A A A AL ALL AL ALL AL ALL AL ALL AL ALL baseline A AL ALL Total misses C-dom Domain-0 Call-C Sip-S Media-S Cache misses for standard configuration © 2009 Avaya Inc. All rights reserved. 27
28.
Conclusion New soft
real-time aware scheduler for Xen – Better support for real-time applications without penalizing non-real time tasks – Fully utilizing CPU resources – Timeliness requirement expressed by laxity © 2009 Avaya Inc. All rights reserved. 28
29.
Backup
© 2009 Avaya Inc. All rights reserved.
30.
Result (Various laxity
value) Lower laxity more realtime better quality various laxity values - standard configuration © 2009 Avaya Inc. All rights reserved. 30
31.
Result (Various laxity
value) Lower laxity more realtime better quality various laxity values - cpuload configuration © 2009 Avaya Inc. All rights reserved. 31
32.
Result (Load balance)
Load balancing is essential for multicore PESQ improvement through load balancer in standard configuration © 2009 Avaya Inc. All rights reserved. 32
33.
Result (Boost with
event) Some impact Adding Boost with event © 2009 Avaya Inc. All rights reserved. 33
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