summaryrefslogtreecommitdiff
path: root/src/mem/bus.cc
diff options
context:
space:
mode:
authorVincentius Robby <acolyte@umich.edu>2007-06-20 14:54:17 -0400
committerVincentius Robby <acolyte@umich.edu>2007-06-20 14:54:17 -0400
commitd540dde5b4ed38c5aec846282082dd04fce24b78 (patch)
tree38d1ad4e76ddeacc556449f8e8d85d8fe1c13050 /src/mem/bus.cc
parentf65e2710ecb725f9f44e0e9edd8389f39720cd64 (diff)
downloadgem5-d540dde5b4ed38c5aec846282082dd04fce24b78.tar.xz
Removed "adding instead of dividing" trick.
Caused slowdown in performance instead of speeding up. src/cpu/base.cc: Removed "adding instead of dividing" trick. src/mem/bus.cc: Fixed spelling in comments. Removed "adding instead of dividing" trick. --HG-- extra : convert_revision : 65a736f4f09a64e737dc7aeee53b117976330488
Diffstat (limited to 'src/mem/bus.cc')
-rw-r--r--src/mem/bus.cc18
1 files changed, 10 insertions, 8 deletions
diff --git a/src/mem/bus.cc b/src/mem/bus.cc
index 13e545064..806c7ed85 100644
--- a/src/mem/bus.cc
+++ b/src/mem/bus.cc
@@ -115,11 +115,14 @@ void Bus::occupyBus(PacketPtr pkt)
//Bring tickNextIdle up to the present tick
//There is some potential ambiguity where a cycle starts, which might make
//a difference when devices are acting right around a cycle boundary. Using
- //a < allows things which happen exactly on a cycle boundary to take up only
- //the following cycle. Anthing that happens later will have to "wait" for
- //the end of that cycle, and then start using the bus after that.
- while (tickNextIdle < curTick)
- tickNextIdle += clock;
+ //a < allows things which happen exactly on a cycle boundary to take up
+ //only the following cycle. Anything that happens later will have to "wait"
+ //for the end of that cycle, and then start using the bus after that.
+ if (tickNextIdle < curTick) {
+ tickNextIdle = curTick;
+ if (tickNextIdle % clock != 0)
+ tickNextIdle -= (curTick % clock) + clock;
+ }
// The packet will be sent. Figure out how long it occupies the bus, and
// how much of that time is for the first "word", aka bus width.
@@ -132,10 +135,9 @@ void Bus::occupyBus(PacketPtr pkt)
// We're using the "adding instead of dividing" trick again here
if (pkt->hasData()) {
int dataSize = pkt->getSize();
- for (int transmitted = 0; transmitted < dataSize;
- transmitted += width) {
+ numCycles += dataSize/width;
+ if (dataSize % width)
numCycles++;
- }
} else {
// If the packet didn't have data, it must have been a response.
// Those use the bus for one cycle to send their data.