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| /gem5/src/mem/ | ||
| H A D | dram_ctrl.hh | 10889:c4c13fced000 Fri Jul 03 10:14:00 EDT 2015 Andreas Hansson <andreas.hansson@arm.com> mem: Avoid DRAM write queue iteration for merging and read lookup This patch adds a simple lookup structure to avoid iterating over the write queue to find read matches, and for the merging of write bursts. Instead of relying on iteration we simply store a set of currently-buffered write-burst addresses and compare against these. For the reads we still perform the iteration if we have a match. For the writes, we rely entirely on the set. Note that there are corner-cases where sub-bursts would actually not be mergeable without a read-modify-write. We ignore these cases and opt for speed. |
| H A D | dram_ctrl.cc | 10889:c4c13fced000 Fri Jul 03 10:14:00 EDT 2015 Andreas Hansson <andreas.hansson@arm.com> mem: Avoid DRAM write queue iteration for merging and read lookup This patch adds a simple lookup structure to avoid iterating over the write queue to find read matches, and for the merging of write bursts. Instead of relying on iteration we simply store a set of currently-buffered write-burst addresses and compare against these. For the reads we still perform the iteration if we have a match. For the writes, we rely entirely on the set. Note that there are corner-cases where sub-bursts would actually not be mergeable without a read-modify-write. We ignore these cases and opt for speed. |
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