Okay, so what if there never was a block in that set (e.g. its the first
time any block ever is being inserted into the set)? Does it just return
a hex value corresponding to whatever garbage value was in that memory
location?
By the way, thanks for the help, and thanks for making M5!
Adam
On 3/8/2011 7:18 PM, Steve Reinhardt wrote:
findVictim() will return an invalid block to be written to without
doing an unnecessary replacement.
On Tue, Mar 8, 2011 at 4:03 PM, Adam Jacobvitz <[email protected]
<mailto:[email protected]>> wrote:
So how do you handle the first write into the cache before there
is anything to replace? I'm also noticing a lot of "misses" in the
caches for which there is no replacement event.
Thanks,
Adam
On 3/8/2011 6:42 PM, Steve Reinhardt wrote:
On Tue, Mar 8, 2011 at 10:07 AM, Adam Jacobvitz <[email protected]
<mailto:[email protected]> <mailto:[email protected]
<mailto:[email protected]>>> wrote:
Two Questions:
1) How are blocks written into the L1 or L2 cache when
there is no
block to replace? I see this thing called a "tempBlock" but I
can't seem to find the code that writes it into the cache...
It isn't written in... that's the point, if there's no block
to replace, then you can't write it into the cache. In
practice I don't know if that ever happens though.
2) In the M5 Cache structure (not Ruby) I can't seem to
find any
notion of a "way". Does the cache structure know what a
"way" is?
Not really, the code is organized based on sets rather than
ways. See src/mem/cache/tags/cacheset.hh.
Steve
Thanks!
-- Adam Jacobvitz
Graduate Student
Duke Computer Architecture Group
Electrical and Computer Engineering Department
Duke University, North Carolina
http://arch.cs.duke.edu/
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