newfs locks entire machine for 20seconds

Steven Hartland killing at multiplay.co.uk
Wed Jan 30 13:54:19 PST 2008


----- Original Message ----- 
From: "Ivan Voras" <ivoras at freebsd.org>
>> The machine is running with ULE on 7.0 as mention using an Areca 1220
>> controller over 8 disks in RAID 6 + Hotspare.
> 
> I'd suggest you first try to reproduce the stall without ULE, while
> keeping all other parameters exactly the same.

Ok tried with an updated 7 world / kernel as of this afternoon and with 4BSD
instead of ULE and no difference the machine still locks up with no activity
for anywhere from 20 to 30 seconds.

Here's a snapshot from top under cpu and io modes when the stall has occured
[top]
last pid:  1102;  load averages:  0.02,  0.08,  0.07                                           up 0+00:09:37  21:39:13
162 processes: 4 running, 145 sleeping, 13 waiting
CPU states:  0.0% user,  0.0% nice,  0.4% system,  0.0% interrupt, 99.6% idle
Mem: 60M Active, 19M Inact, 54M Wired, 56K Cache, 27M Buf, 3809M Free
Swap: 4096M Total, 4096M Free

  PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
   12 root        1 171 ki31     0K    16K RUN    0   8:59 97.90% idle: cpu0
   11 root        1 171 ki31     0K    16K RUN    1   8:57 95.80% idle: cpu1
 1102 root        1  -8    0  4752K  1256K physrd 1   0:01 19.64% newfs
    4 root        1  -8    -     0K    16K -      0   0:00  0.10% g_down
 1048 root        1  96    0  7656K  2544K CPU0   0   0:01  0.00% top
 1054 root        1  96    0  7656K  2348K CPU1   1   0:01  0.00% top
  863 root        1  96    0   131M 15768K select 0   0:00  0.00% httpd
 1055 root        1  96    0 32928K  4656K select 0   0:00  0.00% sshd


last pid:  1102;  load averages:  0.02,  0.08,  0.07                                           up 0+00:09:37  21:39:13
162 processes: 4 running, 145 sleeping, 13 waiting
CPU states:  0.0% user,  0.0% nice,  0.4% system,  0.0% interrupt, 99.6% idle
Mem: 60M Active, 19M Inact, 54M Wired, 56K Cache, 27M Buf, 3809M Free
Swap: 4096M Total, 4096M Free

  PID USERNAME   VCSW  IVCSW   READ  WRITE  FAULT  TOTAL PERCENT COMMAND
   12 root          9    154      0      0      0      0   0.00% idle: cpu0
   11 root         28      5      0      0      0      0   0.00% idle: cpu1
 1102 root          5      0      0      0      0      0   0.00% newfs
    4 root         14      0      0      0      0      0   0.00% g_down
 1048 root          1      0      0      0      0      0   0.00% top
 1054 root          1      0      0      0      0      0   0.00% top
  863 root          1      0      0      0      0      0   0.00% httpd
[/top]

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