Re: [PATCH v8 74/74] cputlb: queue async flush jobs without the BQL

[Alex Bennée]

Robert Foley <address@hidden> writes:

> From: "Emilio G. Cota" <address@hidden>
>
> This yields sizable scalability improvements, as the below results show.
>
> Host: Two Intel E5-2683 v3 14-core CPUs at 2.00 GHz (Haswell)
>
> Workload: Ubuntu 18.04 ppc64 compiling the linux kernel with
> "make -j N", where N is the number of cores in the guest.
>
>                       Speedup vs a single thread (higher is better):
>
>          14 +---------------------------------------------------------------+
>             |       +    +       +      +       +      +      $$$$$$  +     |
>             |                                            $$$$$              |
>             |                                      $$$$$$                   |
>          12 |-+                                $A$$                       +-|
>             |                                $$                             |
>             |                             $$$                               |
>          10 |-+                         $$    ##D#####################D   +-|
>             |                        $$$ #####**B****************           |
>             |                      $$####*****                   *****      |
>             |                    A$#*****                             B     |
>           8 |-+                $$B**                                      +-|
>             |                $$**                                           |
>             |               $**                                             |
>           6 |-+           $$*                                             +-|
>             |            A**                                                |
>             |           $B                                                  |
>             |           $                                                   |
>           4 |-+        $*                                                 +-|
>             |          $                                                    |
>             |         $                                                     |
>           2 |-+      $                                                    +-|
>             |        $                                 +cputlb-no-bql $$A$$ |
>             |       A                                   +per-cpu-lock ##D## |
>             |       +    +       +      +       +      +     baseline **B** |
>           0 +---------------------------------------------------------------+
>                     1    4       8      12      16     20      24     28
>                                        Guest vCPUs
>   png: https://imgur.com/zZRvS7q

Can we re-run these numbers on the re-based series?

-- 
Alex Bennée