diff --git a/ci/Jenkinsfile-ppc64le-cuda10 b/ci/Jenkinsfile-ppc64le-cuda10
index 02404c38f..23ab09e5d 100644
--- a/ci/Jenkinsfile-ppc64le-cuda10
+++ b/ci/Jenkinsfile-ppc64le-cuda10
@@ -24,7 +24,7 @@ def linuxwheel = "ppc64le-centos7-cuda10.whl"
 def testtype = "dotest-single-gpu"
 def testtype_multi_gpu = "dotest-multi-gpu"
 def labelbuild = "ibm-power-gpu"
-def labeltest_multi_gpu = "ibm-power-gpu && !mr-0xp2"
+def labeltest_multi_gpu = "mr-0xp2"
 def labeltest = "ibm-power-gpu && !mr-0xp2"
 def labelruntime = "ibm-power-gpu"
 def doingbenchmark = "0"
diff --git a/ci/base/Jenkinsfile-ppc64le-cuda10.base b/ci/base/Jenkinsfile-ppc64le-cuda10.base
index 13d108687..99b5f6407 100644
--- a/ci/base/Jenkinsfile-ppc64le-cuda10.base
+++ b/ci/base/Jenkinsfile-ppc64le-cuda10.base
@@ -18,7 +18,7 @@ def linuxwheel = "ppc64le-centos7-cuda10.whl"
 def testtype = "dotest-single-gpu"
 def testtype_multi_gpu = "dotest-multi-gpu"
 def labelbuild = "ibm-power-gpu"
-def labeltest_multi_gpu = "ibm-power-gpu && !mr-0xp2"
+def labeltest_multi_gpu = "mr-0xp2"
 def labeltest = "ibm-power-gpu && !mr-0xp2"
 def labelruntime = "ibm-power-gpu"
 def doingbenchmark = "0"
diff --git a/tests/python/open_data/gbm/test_xgboost.py b/tests/python/open_data/gbm/test_xgboost.py
index 22874a8c6..4cc1d1ad8 100644
--- a/tests/python/open_data/gbm/test_xgboost.py
+++ b/tests/python/open_data/gbm/test_xgboost.py
@@ -113,7 +113,7 @@ def test_xgboost_covtype_multi_gpu():
     with LocalCUDACluster(n_workers=n_gpus, threads_per_worker=1) as cluster:
         with Client(cluster) as client:
             # Convert input data from numpy to XGBoost format
-            partition_size = 100000
+            partition_size = 10000
 
             # remove when https://github.com/dmlc/xgboost/issues/4987 is fixed
             dask_X_train = da.from_array(X_train, partition_size)