This patchset add virtual L3 cache support.
For KVM's linux guest, this will reduces amouts of IPIs under some workloads.
In our experiments(vm:1*socket,8*cores,2threads workload:SAP-HANA-PB-testsuite),
this reduces 85% guest's resched-IPIs, and the performance improves 7.2%~33.1%.
---
Changes since v3:
- add 2.8 machine: because 2.7 was released.
- makes the commit message more clearly.
Changes since v2:
- add more useful commit mesage.
- rename "compat-cache" to "l3-cache-shared".
Changes since v1:
- fix the compat problem: set compat_props on PC_COMPAT_2_7.
- fix a "intentionally introducde bug": make intel's and amd's consistently.
- fix the CPUID.(EAX=4, ECX=3):EAX[25:14].
- test the performance if vcpus running on sparate sockets: with L3 cache,
the performance improves 7.2%~33.1%(avg: 15.7%).
---
Longpeng(Mike) (2):
pc: Add 2.8 machine
target-i386: present virtual L3 cache info for vcpus
hw/i386/pc_piix.c | 16 +++++++++++++---
hw/i386/pc_q35.c | 13 +++++++++++--
include/hw/compat.h | 2 ++
include/hw/i386/pc.h | 12 ++++++++++++
target-i386/cpu.c | 49 ++++++++++++++++++++++++++++++++++++++++++++-----
target-i386/cpu.h | 6 ++++++
6 files changed, 88 insertions(+), 10 deletions(-)
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1.8.3.1
