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 17:46:30 +0100
Paolo Valente <paolo.valente@xxxxxxxxxx> wrote:

> > Il giorno 13 dic 2018, alle ore 17:41, stan
> > <stanl-fedorauser@xxxxxxxxxxx> ha scritto:
> > 
 
> You don't have bfq for a comparison, but you can still get an idea of
> how good your system is, by comparing these start-up times with how
> long the same application takes to start when there is no I/O.  Just
> do
> 
> sudo ./comm_startup_lat.sh <scheduler-you-want-to-test> 0 0 seq 3
> "replay-startup-io gnometerm"
> 
cfq with the above command (without I/O):  *BIG* difference.

Latency statistics:
         min         max         avg     std_dev     conf99%
        1.34       1.704     1.53367    0.183118     3.66336
Aggregated throughput:
         min         max         avg     std_dev     conf99%
           0        8.03     5.23143     2.60745     15.4099
Read throughput:
         min         max         avg     std_dev     conf99%
           0        8.03     5.22571     2.60522     15.3967
Write throughput:
         min         max         avg     std_dev     conf99%
           0        0.02  0.00571429  0.00786796   0.0464991

> and get ready to be surprised (next surprise when/if you'll try with
> bfq ...)

I had a response saying that bfq isn't available for single queue
devices, but there might be a workaround.  So it might or might not
happen, depending on whether I can get it working.

> > 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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