From: Vahid Moghaddasi (sunman@ureach.com)
Date: Wed Jul 31 2002 - 13:37:32 EDT
Hi everyone,
We have a "Serious mutex contention" as se
toolkit puts it. The system is a 4500 4x4
and exporting about 90GB of disk space as an
nfs server to 4 other systems. Heavy
compilation is done on the system all day.
CPU Status from top shows 0% idle. Here is a
first few lines of lockstat sleep 5:
Count indv cuml rcnt spin
Lock
Caller
-------------------------------------------------------------------------------
210070 42% 42% 1.00 102
vx_bc_bfree_lk
vx_bc_brelse+0x7c
168414 33% 75% 1.00 90
vx_bc_bfree_lk
vx_bc_getblk+0x88
44338 9% 84% 1.00 51
0x662b4b08
vx_bmap+0x2ec
29362 6% 90% 1.00 61
0x662b4b08
vx_bmap+0x10
22342 4% 94% 1.00 113
vx_bc_bfree_lk
vx_bc_getblk+0x2ec
19893 4% 98% 1.00 74
0x662b4b08
vx_bmap+0x1ec
9168 2% 100% 1.00 61
0x662b4b08
vx_do_bmap_typed+0x220
23 0% 100% 1.00 161
vx_sched_lk
vx_worklist_thread+0x38
11 0% 100% 1.00 20
vx_worklist_lk
vx_worklist_process+0xb4
outout of mpstat:
CPU minf mjf xcal intr ithr csw icsw migr
smtx srw syscl usr sys wt idl
0 12 0 561 4308 375 10868 3941 49
23084 0 969 42 58 0 0
1 1 1 259 4119 120 10849 3973 53
22867 0 2006 34 66 0 0
4 1 2 161 4600 289 11265 4305 57
22473 0 1252 42 58 0 0
5 26 1 850 4729 255 11494 4296 50
22453 0 845 40 60 0 0
Here is some kernel parameters which might
help!!!
ncstats: 3372263
ncsize: 69992
ufs_ninode: 69992
maxusers: 1024
max_nprocs: 16394
maxuprc: 16389
ndquot: 26634
nbuf: 800
vmstat -s cache_ratio output:
...
9920068 total name lookups (cache hits 35%)
...
Any help would be appreciated and as always
I will summarize.
VAhid.
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