RPI3 swap experiments (r338342 with vm.pageout_oom_seq="1024" and 6 GB swap)

[Mark Millard]

On 2018-Sep-5, at 10:15 PM, bob prohaska <fbsd at www.zefox.net> wrote:

>> . . .
> There were two buildworld tests run with 6 GB of swap, the first without
> TRIM being turned on and the second with TRIM turned on. The second run
> too an hour longer, with TRIM being on the only difference. 

buildworld did not take an hour longer for one vs. the other
based on the timestamps in the log files:

trim off:

>>> World build started on Sun Sep  2 20:28:12 PDT 2018
. . .
>>> World build completed on Mon Sep  3 21:35:47 PDT 2018

So somewhat over 25 hours 7 minutes.

trim on:

>>> World build started on Tue Sep  4 00:02:36 PDT 2018
. . .
>>> World build completed on Wed Sep  5 01:12:47 PDT 2018

So somewhat over 25 hours 10 minutes.

I get an under 5 minute difference from those timestamps.


>> . . .
> Near as I can tell there are no non-zero values for d/s, which if it's tied
> to TRIM is reasonable for all but microSD, which did have TRIM enabled. Since
> microSD wasn't particularly busy, apart from swap, that too is unsurprising.

http://www.zefox.net/~fbsd/rpi3/swaptests/r338342/3gbsd_3gbusb/trim_on/writedelay.sort
shows ms/d and its matching kBps with the below non-zero figures:

. . .
    0      0      0      0    0.0      0      6   16.2      0     10    0.1    0.3  mmcsd0
    0      0      0      0    0.0      0      6   16.3      0     10    0.2    0.3  mmcsd0s2
. . .
    0      0      0      0    0.0      0      3   99.2      0      4   40.7    1.3  mmcsd0s2a
    0      0      0      0    0.0      0      3   99.3      0      4   40.8    1.3  ufs/rootfs
. . .
    0      0      0      0    0.0      0     10  147.6      0      6   12.0    4.5  mmcsd0s2a
. . .
    0      2      1      8    1.8      0      7  211.0      0     10  114.5    5.8  mmcsd0
    0      2      1      8    1.8      0      7  211.1      0     10  114.5    5.8  mmcsd0s2
    0      1      0      0    0.0      0      7  211.2      0     10  114.6    5.6  ufs/rootfs
. . .

Those are all I found. I may have missed some.




===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)