Same modification as above.

Modified formulas from 3:

Read_time_for_this_cache will be R = RH+miss_rate*RLL

Write_time_for_this_cache will be W = WH + (1 – %wb)*WLL

9. A cache is write-back, write-allocate, with write buffer to a lower level

We write to lower level every time we evict a dirty block and we pay for this D.

Now with write buffer we will pay D only when we cannot use write buffer.

Modified formulas from 4:

Read_time_for_this_cache will be R = RH+miss_rate*(RLL + E) =

RH+miss_rate*(RLL + %dirty*(1 – %wb)*D) Write_time_for_this_cache will be W =WH+miss_rate*(RLL + E) =

WH+miss_rate*(RLL + %dirty*(1 – %wb)*D)

10. A cache is write-back, no-write-allocate, with write buffer to a lower level

We write to lower level every time we evict a dirty block and we pay for this D.

Now with write buffer we will pay D only when we cannot use write buffer.

We also write to lower level every time we have a write miss, and we pay for this WLL.

Now with write buffer we will pay WLL only when we cannot use write buffer.

Modified formulas from 5:

Read_time_for_this_cache will be R = RH+miss_rate*(RLL + E) =

RH+miss_rate*(RLL + %dirty*(1 – %wb)*D)

Write_time_for_this_cache will be W = WH+miss_rate*(1 – %wb)*WLL