Patch 141414-01 : U7 sustaining gate
Tuesday Jun 16, 2009
Patch 141414-01 which was released yesterday (Update 7 sustaining gate for SPARC) has a couple of interesting performance related fixes for larger systems. I came across a case of 6682267 at a customer last week. Lockstat -C outputs looks something like this
root@xxxxxxxx-M9000 # lockstat -C -s 50 -n 1000000000 sleep 10 | more
Adaptive mutex spin: 1097781 events in 16.337 seconds (67195 events/sec)
-------------------------------------------------------------------------------
Count indv cuml rcnt nsec Lock Caller
99062 9% 9% 0.00 232883 pcf+0x8 page_create_putback+0x64
nsec ------ Time Distribution ------ count Stack
512 | 62 page_alloc_pages+0x16c
1024 | 675 anon_map_getpages+0x348
2048 | 2162 segvn_fault_anonpages+0x384
4096 |@ 6125 segvn_fault+0x530
8192 |@@@ 11233 as_fault+0x4c8
16384 |@@ 9625 pagefault+0xac
32768 |@@@@ 13437 trap+0xd50
65536 |@@@@@@ 22915 utl0+0x4c
131072 |@@@@ 13585
262144 |@@ 7181
524288 |@ 3778
1048576 | 2975
2097152 | 2439
4194304 | 1898
8388608 | 891
16777216 | 78
33554432 | 2
67108864 | 1
-------------------------------------------------------------------------------
Count indv cuml rcnt nsec Lock Caller
90004 8% 17% 0.00 306645 pcf+0x8 page_create_wait+0xa0
nsec ------ Time Distribution ------ count Stack
512 | 74 page_alloc_pages+0x68
1024 | 804 anon_map_getpages+0x348
2048 | 1554 segvn_fault_anonpages+0x384
4096 |@ 3909 segvn_fault+0x530
8192 |@@ 8361 as_fault+0x4c8
16384 |@@@@ 12636 pagefault+0xac
32768 |@@@@@ 16311 trap+0xd50
65536 |@@@@@ 15513 utl0+0x4c
131072 |@@@ 10583
262144 |@@ 6068
524288 |@ 3897
1048576 |@ 3335
2097152 |@ 3077
4194304 | 2652
8388608 | 1108
16777216 | 112
33554432 | 7
67108864 | 3
Worth considering this patch under load if you see a similar stack or drop me a mail as I have a few bits of D and MDB which can help confirm the initial analysis.
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