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

[bob prohaska]

On Thu, Sep 06, 2018 at 12:08:09AM -0700, Mark Millard wrote:
> 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.
> 
> 

You are correct, the mistake is mine. Thanks for catching it!

> >> . . .
> > 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.
>

Again, I was mistaken, misreading your original question. 

Thanks for catching the errors!

bob prohaska