No description
5ebb8ec46b
When the snoopFilter receives a response, it updates its state using the hasSharers flag (indicates whether there are more than one copies of the block in the caches above). The hasSharers flag of the packet was previously populated when the request was traversing and snooping the caches looking for the block. 1) When the response is coming from the memory-side port, its order with respect to other responses is not necessarily preserved (e.g., a request that arrived second to the xbar can get its response first). As a result the snoopFilter might process responses out of order updating its residency information using the non valid hasSharers flag which was populated much earlier. 2) When the response is from an on-chip, the MSHRs preserve a well defined order and the hasSharers flag should contain valid information. This patch changes the snoopFilter by avoiding the hasSharers flag when the response is from the memory-side port. Change-Id: Ib2d22a5b7bf3eccac64445127d2ea20ee74bb25b Reviewed-by: Andreas Hansson <andreas.hansson@arm.com> Reviewed-by: Stephan Diestelhorst <stephan.diestelhorst@arm.com> |
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| system | ||
| tests | ||
| util | ||
| .gitignore | ||
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| COPYING | ||
| LICENSE | ||
| README | ||
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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.