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This patch improves the snoop filter allocation decisions by not only looking at whether a port is snooping or not, but also if the packet actually came from a cache. The issue with only looking at isSnooping is that the CPU ports, for example, are snooping, but not actually caching. Previously we ended up incorrectly allocating entries in systems without caches (such as the atomic and timing quick regressions). Eventually these misguided allocations caused the snoop filter to panic due to an excessive size. On the request path we now include the fromCache check on the packet itself, and for responses we check if we actually have a snoop-filter entry. Change-Id: Idd2dbc4f00c7e07d331e9a02658aee30d0350d7e Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-by: Stephan Diestelhorst <stephan.diestelhorst@arm.com> Reviewed-by: Tony Gutierrez <anthony.gutierrez@amd.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/Introduction, and for more information about building the simulator and getting started please see http://www.gem5.org/Documentation and http://www.gem5.org/Tutorials. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, SWIG, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/Dependencies for more details concerning the minimum versions of the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ALPHA, ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/Build_System for more details and options. With the simulator built, have a look at http://www.gem5.org/Running_gem5 for more information on how to use gem5. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - 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 will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. Please see the gem5 download page for these items at http://www.gem5.org/Download If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.