[lustre-devel] [PATCH 09/13] lustre; obdclass: server qos penalty miscaculated

James Simmons jsimmons at infradead.org
Sat May 15 06:06:06 PDT 2021

From: Lai Siyao <lai.siyao at whamcloud.com>

Server qos penalty calculation uses active target count, but it
should use server count, which will make it larger than expected,
then weight of targets are often 0, and finally cause MDT0 is
often chosen in qos allocation.

Fixes: 3f2a3e1d4 ("lustre: obdclass: lu_tgt_descs cleanup")
WC-bug-id: https://jira.whamcloud.com/browse/LU-13440
Lustre-commit: 0ccce7ecb72f847f ("LU-13440 obdclass: server qos penalty miscaculated")
Signed-off-by: Lai Siyao <lai.siyao at whamcloud.com>
Reviewed-on: https://review.whamcloud.com/43385
Reviewed-by: Andreas Dilger <adilger at whamcloud.com>
Reviewed-by: Hongchao Zhang <hongchao at whamcloud.com>
Signed-off-by: James Simmons <jsimmons at infradead.org>
 fs/lustre/obdclass/lu_tgt_descs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/lustre/obdclass/lu_tgt_descs.c b/fs/lustre/obdclass/lu_tgt_descs.c
index cb62ce4..9f33d22 100644
--- a/fs/lustre/obdclass/lu_tgt_descs.c
+++ b/fs/lustre/obdclass/lu_tgt_descs.c
@@ -633,7 +633,7 @@ int ltd_qos_update(struct lu_tgt_descs *ltd, struct lu_tgt_desc *tgt,
 	ltq->ltq_penalty += ltq->ltq_penalty_per_obj *
 	svr->lsq_penalty += svr->lsq_penalty_per_obj *
-			    ltd->ltd_lov_desc.ld_active_tgt_count;
+			    qos->lq_active_svr_count;
 	/* Decrease all MDS penalties */
 	list_for_each_entry(svr, &qos->lq_svr_list, lsq_svr_list) {

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