Hello,
Among the cache parameters in user-postload.simics, the following is
defined:
flexus.set "-L1d:clean_evict" "1" # "Issue clean evictions"
(CleanEvictions) -- trace
flexus.set "-L1d:allow_evict_clean" "1" # "Cause the cache to evict
clean blocks" (EvictClean) -- timing
which is set (1) for L1 caches and cleared (0) for L2 caches. I would
like to ask what difference does it make in the eviction policy of the
CMP system.
Furthermore, I see in debug.out (vverb debugging) that whenever a block
is evicted from L1, a message is generated from the L2 component
(examples shown in the end of the post). I would like to ask what kind
of messages are these, since such evictions should only take place in
the L1 cache (as I have seen).
Thank you,
George
----------
Examples from debug.out
9751 <FastCacheImpl.cpp:308> {1000}- sys-L1d Evict:
MemoryMessage[Eviction (dirty)]: Addr:0xp:008947c00 Size:0 Serial: 5
Core: 0 DStream: true Outstanding Msgs: 0 Requires Ack
9752 <FastCMPCacheImpl.cpp:380> {1000}- sys-L2 Received on Port
RequestIn[0] Request: MemoryMessage[Eviction (dirty)]:
Addr:0xp:008947c00 Size:0 Serial: 5 Core: 0 DStream: true Outstanding
Msgs: 0 Requires Ack
9753 <FastCMPCacheImpl.cpp:547> {1000}- sys-L2 Received Eviction
(dirty) for 0xp:008947c00 from 0, state = OneSharer, sharers =
0000000000000000000000000000000000000000000000000000000000000001, cache
state = Invalid
12696 <FastCacheImpl.cpp:308> {1000}- sys-L1d Evict:
MemoryMessage[Eviction (writable)]: Addr:0xp:002c7bc00 Size:0 Serial: 5
Core: 0 DStream: true Outstanding Msgs: 0 Requires Ack
12697 <FastCMPCacheImpl.cpp:380> {1000}- sys-L2 Received on Port
RequestIn[0] Request: MemoryMessage[Eviction (writable)]:
Addr:0xp:002c7bc00 Size:0 Serial: 5 Core: 0 DStream: true Outstanding
Msgs: 0 Requires Ack
12698 <FastCMPCacheImpl.cpp:547> {1000}- sys-L2 Received Eviction
(writable) for 0xp:002c7bc00 from 0, state = OneSharer, sharers =
0000000000000000000000000000000000000000000000000000000000000001, cache
state = Exclusive
30456 <FastCacheImpl.cpp:308> {3000}- sys-L1i Evict:
MemoryMessage[Eviction (clean)]: Addr:0xp:009a7d9c0 Size:0 Serial: 7
Core: 0 DStream: false Outstanding Msgs: 0 Requires Ack
30457 <FastCMPCacheImpl.cpp:361> {3000}- Received on Port
FetchRequestIn[0] Request: MemoryMessage[Eviction (clean)]:
Addr:0xp:009a7d9c0 Size:0 Serial: 7 Core: 0 DStream: false Outstanding
Msgs: 0 Requires Ack
30458 <FastCMPCacheImpl.cpp:547> {3000}- sys-L2 Received Eviction
(clean) for 0xp:009a7d9c0 from 1, state = OneSharer, sharers =
0000000000000000000000000000000000000000000000000000000000000010, cache
state = Shared
