Marcus Tshibangu via gem5-users <gem5-users <at> gem5.org> writes:

> 
> is miss rate only computed on read requests? because all the stats.txt 
I look, they don't account for write requests at all. here is an 
example:
> 
> system.l2.ReadExReq_accesses::total          12365514                 
      # number of ReadExReq accesses(hits+misses)
> system.l2.ReadReq_accesses::total            73364986                 
      # number of ReadReq accesses(hits+misses)
> system.l2.overall_accesses::total            85730500                 
      # number of overall (read+write) accesses
> system.l2.overall_misses::total               5217265                 
      # number of overall misses
> 
> 
> system.l2.overall_miss_rate::total           0.060857                 
      # miss rate for overall accesses
> 
> system.l2.Writeback_accesses::writebacks     67311441                 
      # number of Writeback accesses(hits+misses)
> system.l2.Writeback_hits::total                       67311441         
              # number of Writeback hits
> 
> 
> in the above sample statistics, it looks as 
l2.overall_accesses=85,730,500 is not really read+write, but it's only 
ReadExReq+ReadReq = 85,730,500 and the miss_rate = 5217265/85,730,500 = 
0.060857
> in no way there is any write_backs accounted for in this miss rate 
calculation
> 
> 2nd when I look at writeback_accesses (hits+misses) = writeback_hits, 
does this means that every single write back from cpu to L2 was ALWAYS a 
hit?? this doesn't look right.
> 
> Any body with a good explanation on these two issues? I might have 
missed something very obvious here
> 
> 
> 
> 
> 
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