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Ali Jafri 52c8ae5187 mem: Enforce insertion order on the cache response path
This patch enforces insertion order transmission of packets on the
response path in the cache. Note that the logic to enforce order is
already present in the packet queue, this patch simply turns it on for
queues in the response path.

Without this patch, there are corner cases where a request-response is
faster than a response-response forwarded through the cache. This
violation of queuing order causes problems in the snoop filter leaving
it with inaccurate information. This causes assert failures in the
snoop filter later on.

A follow on patch relaxes the order enforcement in the packet queue to
limit the performance impact.
2015-11-06 03:26:37 -05:00
build_opts scons: Do not build the InOrderCPU 2015-01-20 08:12:45 -05:00
configs configs: fix bug introduced due to 276ad9121192 2015-11-04 12:36:28 -06:00
ext ext: fix SST connector 2015-10-06 18:08:28 -05:00
src mem: Enforce insertion order on the cache response path 2015-11-06 03:26:37 -05:00
system arm: Add support for ARMv8 (AArch64 & AArch32) 2014-01-24 15:29:34 -06:00
tests stats: Update for UDelayEvent quiesce change 2015-10-10 16:45:41 -05:00
util base: remove Trace::enabled flag 2015-09-30 15:21:55 -05:00
.hgignore ext: Add a McPAT regression tester 2014-06-04 07:48:20 -07:00
.hgtags Added tag stable_2015_09_03 for changeset 60eb3fef9c2d 2015-09-03 15:38:46 -05:00
COPYING copyright: Add code for finding all copyright blocks and create a COPYING file 2011-06-02 17:36:07 -07:00
LICENSE copyright: Add code for finding all copyright blocks and create a COPYING file 2011-06-02 17:36:07 -07:00
README misc: README direct to website for dependencies 2014-08-26 10:12:04 -04:00
SConstruct ext: Add the NoMali GPU no-simulation library 2015-07-07 10:03:13 +01:00

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.