I am using Freebsd 11 installation for several months and have some issues with some applications usage for example firefox, thunderbird or qtcreator can hang and not respond for any action for ~10s. I wanted to investigate this issue but my knowledge in BSD has ended and I need help.
I checked by top if the CPU usage is high but it was around 0-5%. Next I checked the top with the io statistics and it looks like this when the issue occurs:
I didn't found any information of what is the FAULT column but this can be the number of fault disk operations. This is my first question to you know what is FAULT column?
Next I checked my disks. I have ZFS on two mirrored disks and one SSD as cache and log (8 GB RAM):
I started gsmartcontrol app and performed full tests of all 3 disks but there was no errors.
I know there is similar thread Thread SSD-hangs-on-heavy-writing.58266 but I don't know if this is the same issue because my swap is on the mirrored disks not on the SSD. Currently I don't know what could be the cause of this issue.
Where and how I can find what is the cause of those hangs?
I checked by top if the CPU usage is high but it was around 0-5%. Next I checked the top with the io statistics and it looks like this when the issue occurs:
Code:
$ top
1010 processes:1 running, 1007 sleeping, 2 stopped
CPU: 2.5% user, 0.0% nice, 1.4% system, 0.4% interrupt, 95.7% idle
Mem: 728M Active, 316M Inact, 6650M Wired, 127K Buf, 100M Free
ARC: 846M Total, 127M MFU, 142M MRU, 5392K Anon, 73M Header, 498M Other
Swap: 8192M Total, 3252M Used, 4940M Free, 39% Inuse, 100K In
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
5103 user 26 20 0 4346M 4095M select 2 40.9H 15.08% VBoxHeadless
83673 user 1 22 0 3300M 18460K select 1 9:22 14.62% Xorg
86025 user 1 20 0 28312K 7956K CPU7 7 0:00 1.61% top
83758 user 4 20 0 295M 15576K select 2 0:27 1.39% xfce4-terminal
85178 root 2 20 0 222M 13556K select 6 0:14 1.01% gsmartcontrol
83848 user 62 20 0 2050M 910M swread 1 36:48 0.37% firefox
Code:
$ top -m io
PID USERNAME VCSW IVCSW READ WRITE FAULT TOTAL PERCENT COMMAND
5103 user 688 0 0 0 0 0 0.00% VBoxHeadless
83673 user 52 5 0 0 0 0 0.00% Xorg
83848 user 544 0 2 0 241 243 99.18% firefoxNext I checked my disks. I have ZFS on two mirrored disks and one SSD as cache and log (8 GB RAM):
Code:
$ zpool list -v
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
zmain 460G 155G 305G - 23% 33% 1.00x ONLINE -
mirror 460G 155G 305G - 23% 33%
ada2p3 - - - - - -
ada1p3 - - - - - -
log - - - - - -
gpt/log0 7.94G 680K 7.94G - 10% 0%
cache - - - - - -
gpt/cache0 111G 33.5G 77.7G - 0% 30%
Code:
$ sudo camcontrol devlist | grep ada
<SAMSUNG SSD PM810 2.5" 7mm 128GB AXM08D1Q> at scbus0 target 0 lun 0 (ada0,pass0)
<ST9500420AS D005SDM1> at scbus1 target 0 lun 0 (ada1,pass1)
<WDC WD5000AAKS-22A7B2 01.03B01> at scbus3 target 0 lun 0 (ada2,pass3)
Code:
$ uname -a
FreeBSD AMDC727.local 11.0-RELEASE-p2 FreeBSD 11.0-RELEASE-p2 #0: Mon Oct 24 06:55:27 UTC 2016 root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64Where and how I can find what is the cause of those hangs?
