Periodic several second freezes with Raspberry Pi 3

[dankcushions]

thanks very much for the replies!

(06-03-2016 01:16 AM)[Unknown] Wrote:  Deadline is a popular option among flash drives. CFQ is typically the default used with moving-parts disks.

If that affects it, it definitely indicates this is IO latency related. Are you using a cso or iso?

ISO for my work time fun example.

Quote:How much memory does the device have? Could it be swapping - do you see swap usage?

Do pis come by default with zram configured, or do they use SD card swap, or no swap at all?

-[Unknown]

1GB of RAM (256MB allocated to GPU in my case). it's not swapping. in fact, PPSSPP doesn't seem to take a whole bunch of memory up (shouldn't it be loading this whole ISO into memory? WTF is 439MB).

here's the vmstat -a output during a freeze:

Code:

0  1      0 343180 164580 203588    0    0     0   396 2502 2662  1  1 75 23  0
0  0      0 343180 164580 203588    0    0     0     0 2741 3772  5  1 91  4  0
0  0      0 343244 164580 203588    0    0     0     0 2753 3834  6  1 93  0  0
0  0      0 343244 164580 203588    0    0     0     0 2756 3772  6  5 89  0  0
^C
pi@retropie:~ $ vmstat -a 1
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
r  b   swpd   free  inact active   si   so    bi    bo   in   cs us sy id wa st
0  1      0 342996 164580 203492    0    0     0     1    7   13  6  1 93  0  0
0  2      0 342996 164580 203596    0    0     0   324 2624 3283  3  0 60 37  0
0  1      0 342996 164580 203596    0    0     0     4 2778 3904  6  2 73 19  0

the freezes occured when bo spiked (I/O blocks sent). does this mean it's sending data to the SD card? why would it be doing this? no swap, and the game isn't loading anything. weird!

(06-03-2016 03:45 AM)arutema Wrote:  I haven't tried PS1 emulation on the Pi 3 yet, but I suspect it may see similar issues. dankcushions, I don't suppose you have any reports from PS1 emulators?

pcsx_rearmed is flawless on the pi3 (and pi2, pretty much).