Date: Fri, 21 Oct 2016 11:02:57 +0100 From: Steven Hartland <killing@multiplay.co.uk> To: freebsd-stable@freebsd.org Subject: Re: zfs, a directory that used to hold lot of files and listing pause Message-ID: <19a45e94-65e6-53a9-202d-c048055460d1@multiplay.co.uk> In-Reply-To: <91f34889-7f4f-661d-c88f-8034402c39cd@norma.perm.ru> References: <4d9269af-ed64-bb73-eb7f-98a3f5ffd5a2@norma.perm.ru> <40fa9fd6-15aa-d8f7-b958-8783e763e6bc@multiplay.co.uk> <577ab7b2-46c1-5cf0-b6ad-50895978d957@norma.perm.ru> <38a84fce-fd97-a6a1-5820-89e578d76f0b@multiplay.co.uk> <91f34889-7f4f-661d-c88f-8034402c39cd@norma.perm.ru>
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On 21/10/2016 10:04, Eugene M. Zheganin wrote:
> Hi.
>
> On 21.10.2016 9:22, Steven Hartland wrote:
>> On 21/10/2016 04:52, Eugene M. Zheganin wrote:
>>> Hi.
>>>
>>> On 20.10.2016 21:17, Steven Hartland wrote:
>>>> Do you have atime enabled for the relevant volume?
>>> I do.
>>>>
>>>> If so disable it and see if that helps:
>>>> zfs set atime=off <volume>
>>>>
>>> Nah, it doesn't help at all.
>> As per with Jonathon what does gstat -pd and top -SHz show?
>
> gstat (while ls'ing):
>
> dT: 1.005s w: 1.000s
> L(q) ops/s r/s kBps ms/r w/s kBps ms/w d/s kBps
> ms/d %busy Name
> 1 49 49 2948 13.5 0 0 0.0 0 0 0.0
> 65.0| ada0
> 0 32 32 1798 11.1 0 0 0.0 0 0 0.0
> 35.3| ada1
>
Averagely busy then on rust.
> gstat (while idling):
>
> dT: 1.003s w: 1.000s
> L(q) ops/s r/s kBps ms/r w/s kBps ms/w d/s kBps
> ms/d %busy Name
> 0 0 0 0 0.0 0 0 0.0 0 0 0.0
> 0.0| ada0
> 0 2 2 255 0.8 0 0 0.0 0 0 0.0
> 0.1| ada1
>
> top -SHz output doesn't really differ while ls'ing or idling:
>
> last pid: 12351; load averages: 0.46, 0.49,
> 0.46 up 39+14:41:02 14:03:05
> 376 processes: 3 running, 354 sleeping, 19 waiting
> CPU: 5.8% user, 0.0% nice, 16.3% system, 0.0% interrupt, 77.9% idle
> Mem: 21M Active, 646M Inact, 931M Wired, 2311M Free
> ARC: 73M Total, 3396K MFU, 21M MRU, 545K Anon, 1292K Header, 47M Other
> Swap: 4096M Total, 4096M Free
>
> PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
> 600 root 39 0 27564K 5072K nanslp 1 295.0H 24.56% monit
> 0 root -17 0 0K 2608K - 1 75:24 0.00%
> kernel{zio_write_issue}
> 767 freeswitch 20 0 139M 31668K uwait 0 48:29 0.00%
> freeswitch{freeswitch}
> 683 asterisk 20 0 806M 483M uwait 0 41:09 0.00%
> asterisk{asterisk}
> 0 root -8 0 0K 2608K - 0 37:43 0.00%
> kernel{metaslab_group_t}
> [... others lines are just 0% ...]
This looks like you only have ~4Gb ram which is pretty low for ZFS I
suspect vfs.zfs.prefetch_disable will be 1, which will crash the
performance.
Regards
Steve
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