[NCLUG] Choppy performance issues.

[John Gilmore]

Further testing shows the system-wide performance issues went away
when I moved off ZFS. I didn't notice, as minecraft is actually worse.

There's no visible I/O wait time. There's no particular process
bouncing to the top of the top list, even at .5 sec.

Maybe it's a video driver issue? Pretty odd one, if so.

On Tue, Jan 20, 2015 at 10:27 AM, Ray Frush <phred at rflm.net> wrote:
>
> What you’re looking for is something that is probably I/O blocking the whole system.   What do top, and iostat show you when you set the resolution to 1 second.  Perhaps you can catch whatever it is in action.   Try sorting by ‘TIME+’ to see if that pops out a different list of suspects.
>
>
>> On 20 Jan 2015, at 10:04 AM, John Gilmore <j.arthur.gilmore at gmail.com> wrote:
>>
>> I set top to update at 300
>> secs, and this is what I got:
>> top - 09:57:32 up 13:50,  3 users,  load average: 1.20, 1.22, 1.10
>> Tasks: 314 total,   1 running, 313 sleeping,   0 stopped,   0 zombie
>> %Cpu(s):  8.7 us, 25.7 sy,  0.0 ni, 65.4 id,  0.0 wa,  0.0 hi,  0.1 si,  0.0 st
>> KiB Mem:   3803424 total,  2403724 used,  1399700 free,   106848 buffers
>> KiB Swap: 16775164 total,        0 used, 16775164 free,   854228 cached
>>
>>  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND
>> 10946 jgilmore  20   0 1090m 669m  33m S 111.3 18.0  14:42.05 java
>> 6153 jgilmore  15  -5  160m 6476 4536 S   4.1  0.2  23:47.45 pulseaudio
>> 10860 jgilmore  20   0  641m 175m  30m S   2.5  4.7   0:43.03 iceweasel
>> 4495 root      20   0 86572  48m  12m S   1.7  1.3   1:04.85 Xorg
>> 10832 root      20   0     0    0    0 S   1.6  0.0   0:12.47 kworker/3:4
>>
>
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