From bf7a36b2cbacbbf065e7042bee7638f7c8b7b80e Mon Sep 17 00:00:00 2001
From: Mikolaj Izdebski <mizdebsk@redhat.com>
Date: Wed, 17 Aug 2022 17:47:46 +0200
Subject: [PATCH] Koschei: disable builds on aarch64 for now
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aarch64 builders have signifficantly lower capacity that other arches.
They are usually loaded with tasks, while ppc64le and x86_64 ones are
mostly free.  This slows down Koschei as it does not submit scratch
builds until load on aarch64 drops below 75 %.

The following table illustrates capacity of Koji builders in default
channel as of August 17, 2022:

    ┌─────────┬──────────┬──────────┐
    │    arch │ builders │ capacity │
    ├─────────┼──────────┼──────────┤
    │  x86_64 │       46 │      152 │
    │  armhfp │       28 │       56 │
    │ aarch64 │       34 │       68 │
    │   ppc64 │       37 │      148 │
    │ ppc64le │       37 │      148 │
    │   s390x │       27 │       67 │
    └─────────┴──────────┴──────────┘
---
 roles/openshift-apps/koschei/templates/config-backend.cfg.j2  | 3 ++-
 roles/openshift-apps/koschei/templates/config-frontend.cfg.j2 | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/roles/openshift-apps/koschei/templates/config-backend.cfg.j2 b/roles/openshift-apps/koschei/templates/config-backend.cfg.j2
index 58411c18ad..ef18d2e823 100644
--- a/roles/openshift-apps/koschei/templates/config-backend.cfg.j2
+++ b/roles/openshift-apps/koschei/templates/config-backend.cfg.j2
@@ -22,7 +22,8 @@ config = {
         "task_priority": 30,
         {% else %}
         "max_builds": 60,
-        "build_arches": ['x86_64', 'aarch64', 'ppc64', 'ppc64le'],
+        "build_arches": ['x86_64', 'ppc64', 'ppc64le'],
+        # "build_arches": ['x86_64', 'aarch64', 'ppc64', 'ppc64le'],
         "load_threshold": 0.75,
         "task_priority": 30,
         {% endif %}
diff --git a/roles/openshift-apps/koschei/templates/config-frontend.cfg.j2 b/roles/openshift-apps/koschei/templates/config-frontend.cfg.j2
index ef64f734ec..1ab59df042 100644
--- a/roles/openshift-apps/koschei/templates/config-frontend.cfg.j2
+++ b/roles/openshift-apps/koschei/templates/config-frontend.cfg.j2
@@ -15,7 +15,8 @@ config = {
         {% if env == 'staging' %}
         "build_arches": ['x86_64'],
         {% else %}
-        "build_arches": ['x86_64', 'aarch64', 'ppc64', 'ppc64le'],
+        "build_arches": ['x86_64', 'ppc64', 'ppc64le'],
+        # "build_arches": ['x86_64', 'aarch64', 'ppc64', 'ppc64le'],
         {% endif %}
     },
     "flask": {