Re: Which I/O scheduler is Fedora switching to in 4.21? mq-deadline or BFQ?

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On Thu, 13 Dec 2018 13:42:24 +0100
Paolo Valente <paolo.valente@xxxxxxxxxx> wrote:

> To test the behavior of your system, why don't you check, e.g., how
> long it takes to start an application while there is some background
> I/O?
> 
> A super quick way to do this is
> 
> git clone https://github.com/Algodev-github/S
> cd S/comm_startup_lat
> sudo ./comm_startup_lat.sh <scheduler-you-want-to-test> 5 5 seq 3
> "replay-startup-io gnometerm"
> 
> The last command line
> - starts the reading of 5 files plus the writing of 5 other files
> - replays, for three times, the I/O that gnome terminal does while;
>   starting up (if you want I can tell you how to change the last
> command line so as to execute the original application, but you would
> get the same results);
> - for each attempt, measures how long this start-up I/O takes to
>   complete.

Results for cfq and noop, haven't enabled bfq yet.  I interpret these
as showing that cfq was a large improvement for all categories except
write throughput, where it actually degraded performance.

cfq

Latency statistics:
         min         max         avg     std_dev     conf99%
      22.142      27.157     24.1967      2.6273     52.5604
Aggregated throughput:
         min         max         avg     std_dev     conf99%
       67.29      139.74     105.491      19.245     39.7628
Read throughput:
         min         max         avg     std_dev     conf99%
       51.73      135.67     102.402     21.3985     44.2123
Write throughput:
         min         max         avg     std_dev     conf99%
        0.01       46.29     3.08857     8.37179     17.2972

noop

Latency statistics:
         min         max         avg     std_dev     conf99%
      40.861      42.021     41.3637    0.595266     11.9086
Aggregated throughput:
         min         max         avg     std_dev     conf99%
       45.66       72.89     55.9847     5.99054     9.87365
Read throughput:
         min         max         avg     std_dev     conf99%
       41.69       70.85     51.9495     6.02467      9.9299
Write throughput:
         min         max         avg     std_dev     conf99%
           0         7.9     4.03527     1.62392     2.67656
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