The document discusses the performance of three SPEC CPU2006 benchmarks - 483.xalancbmk, 462.libquantum, and 471.omnetpp - under different last-level cache (LLC) configurations and when subjected to LLC cache interference from a background workload. Key findings include reduced performance for the benchmarks when run with a smaller LLC size or when interfered with by a LLC jammer workload, but maintained performance when QoS techniques were applied to isolate the benchmark workload in the LLC.

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QoS

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#pqos –e “llc:0=0xff0; llc:7=0x00f;”
-a “llc:0=0-6; llc:7=7;”
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(COS7)
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t4] LOaPWW
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#pqos –r –i 10
CORE IPC MISSES LLC[KB] MBL[MB/s] MBR[MB/s]
:
0 0.41 9907 32.0 0.3 0.0
1 0.36 190312791 8160.0 14524.3 0.0
2 0.23 2537 0.0 0.0 0.0
3 0.25 2563 0.0 0.0 0.0
4 0.88 66305 32.0 2.6 0.0
5 0.24 13501 0.0 0.1 0.0
6 0.10 18645 0.0 0.3 0.0
7 1.20 19505540 4096.0 89.3 0.0
5 ]P 5 ]P
-
5
. 4 4
(COS0)
(COS7)

9. /
B D
60
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2345678910
RelativePerformance[%]
Cache Occupancy [MB]
483.xalancbmk
473.astar
471.omnetpp
464.h264ref
462.libquantum
458.sjeng
456.hmmer
445.gobmk
429.mcf
403.gcc
401.bzip2
400.perlbench
5
[MB]
[%]

10. f m G DA75T
B D x
f G
Target VM Background VM
1 1CPU Cores
LLC
Hypervisor
Memory 4GB 4GB
Target VM Background VM
1 1
Hypervisor
4GB 4GB
(a) QoS (b) QoS
cache jammer: stress -m 1 --vm-keep
--vm-bytes 64M --vm-stride 64
SPECint 2006

11. f PW IP 6n4] LOaPWW D 5o
f T b B7 F% G
Hardware (PM)
CPU Intel Xeon D-1540/2.0GHz
(8 core, LLC 12MB)
M/B Supermicro X10SDV-TLN4F
Memory 64 GB DDR4-2133
Storage Crucial m4 CT512M4SSD2 512GB
Software
OS Debian GNU/Linux 8.3
Kernel Linux kernel 4.1.17
Hardware (VM)
CPU QEMUVirtual CPU version
2.1.2
Memory 4 GB
Storage QEMU QCOW Image (v3)
40GB
Software
OS Debian GNU/Linux 8.3
Kernel Linux kernel 3.16.0-4-amd64

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w/o jammer w/ jammer
)+)-)
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2345678910
RelativePerformance[%]
Cache Occupancy [MB]
483.xalancbmk
473.astar
471.omnetpp
464.h264ref
462.libquantum
458.sjeng
456.hmmer
445.gobmk
429.mcf
403.gcc
401.bzip2
400.perlbench
T
B D
n( 4 o
[MB]
[%]

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10MB 8MB 6MB 4MB 2MB
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LLCSize[KB]
LLCMisses
LLC Size LLC Misses
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LLCSize[KB]
LLCMisses
LLC Size LLC Misses
0
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0
50000
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LLCSize[KB]
LLCMisses
LLC Size LLC Misses
L bLWL NMXV a% B DK M bLWL NMXV 4 K
N bLWL NMXV ( 4 K
5 XT 0 (+/9
5 XT 0 ( 9
(
5 XT 0 ( /9
r 5
s 5
80
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2345678910
RelativePerformance[%]
Cache Occupancy [MB]
483.xalancbmk
(b)
(c)

18. .
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LLCSize[KB]
LLCMisses
LLC Size LLC Misses
0
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12000
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0
50000
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LLCSize[KB]
LLCMisses
LLC Size LLC Misses
A
L WTM L X a% B DK M WTM L X 4 K
80
90
100
110
120
130
140
150
2345678910
RelativePerformance[%]
Cache Occupancy [MB]
462.libquantum
(b)
r 5
s 5
0
2000
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10000
12000
18:56:00
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0
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LLCSize[KB]
LLCMisses
LLC Size LLC Misses
N WTM L X ( 4 K
(c)
5 XT 0 /9
5 XT 0 /9
g
5 XT 0 9

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w/o jammer w/ jammer (QoS)

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