e0a28b1a27
This patch changes the RISCVMatched Cache Hierarchy to
private L1 shared L2.
It also changes the RISCVMatched Core's parameters to
better match hardware performance.
Also, sizes are changed to MiB or KiB instead of MB
or KB, to match the datasheet.
All the changes that deviate from the datasheet and the
ARM HPI CPU (reference for pipeline parameters)
are documented.
The core parameters that are changed are:
- threadPolicy:
This is initialized to "SingleThreaded".
- decodeToExecuteForwardDelay:
This is changed from 1 to 2 to avoid a PMC address fault.
- fetch1ToFetch2BackwardDelay:
This is changed from 1 to 0 to better match hardware performance.
- fetch2InputBufferSize:
This is changed from 2 to 1 to better match hardware performance.
- decodeInputBufferSize:
This is changed from 3 to 2 to better match hardware performance.
- decodeToExecuteForwardDelay:
This is changed from 2 to 1 to better match hardware performance.
- executeInputBufferSize:
This is changed from 7 to 4 to better match hardware performance.
- executeMaxAccessesInMemory:
This is changed from 2 to 1 to better match hardware performance.
- executeLSQStoreBufferSize:
This is changed from 5 to 3 to better match hardware performance.
- executeBranchDelay:
This is changed from 1 to 2 to better match hardware performance.
- enableIdling:
This is changed to False to better match hardware performance.
- MemReadFU: changed to 2 cycles from 3 cycles.
The changes in the branch predictor are:
- BTBEntries:
This is changed from 16 entries to 32 entries.
- RASSize:
This is changed from 6 entries to 12 entries.
- IndirectSets:
This is changed from 8 sets to 16 sets.
- localPredictorSize:
This is changed from 8192 to 16384.
- globalPredictorSize:
This is changed from 8192 to 16384.
- choicePredictorSize:
This is changed from 8192 to 16384.
- localCtrBits:
This is changed from 2 to 4.
- globalCtrBits:
This is changed from 2 to 4.
- choiceCtrBits:
This is changed from 2 to 4.
Change-Id: I4235140f33be6a3b529a819ae6a7223cb88bb7ab
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/70798
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of these tools. Once you have all dependencies resolved, type 'scons build/<CONFIG>/gem5.opt' where CONFIG is one of the options in build_opts like ARM, NULL, MIPS, POWER, SPARC, X86, Garnet_standalone, etc. This will build an optimized version of the gem5 binary (gem5.opt) with the the specified configuration. See http://www.gem5.org/documentation/general_docs/building for more details and options. The main source tree includes these subdirectories: - build_opts: pre-made default configurations for gem5 - build_tools: tools used internally by gem5's build process. - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - include: include files for use in other programs - site_scons: modular components of the build system - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you may need compiled system firmware, kernel binaries and one or more disk images, depending on gem5's configuration and what type of workload you're trying to run. Many of those resources can be downloaded from http://resources.gem5.org, and/or from the git repository here: https://gem5.googlesource.com/public/gem5-resources/ If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.