From dc4637be2882ce9cb03065ce89b859717cc25fb3 Mon Sep 17 00:00:00 2001
From: johann <johann>
Date: Mon, 21 Jul 2008 16:09:16 +0000
Subject: [PATCH] Branch HEAD b=9945 i=bzzz i=adilger
add warning when underlying device is not tuned for larger I/O requests.
---
lustre/obdfilter/filter.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/lustre/obdfilter/filter.c b/lustre/obdfilter/filter.c
index 8f9ac20580..ae88bd632e 100644
--- a/lustre/obdfilter/filter.c
+++ b/lustre/obdfilter/filter.c
@@ -1911,6 +1911,7 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
__u8 *uuid_ptr;
char *str, *label;
char ns_name[48];
+ request_queue_t *q;
int rc, i;
ENTRY;
@@ -2028,6 +2029,15 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
if (rc)
GOTO(err_post, rc);
+ q = bdev_get_queue(mnt->mnt_sb->s_bdev);
+ if (q->max_sectors < q->max_hw_sectors &&
+ q->max_sectors < PTLRPC_MAX_BRW_SIZE >> 9)
+ LCONSOLE_INFO("%s: underlying device %s should be tuned "
+ "for larger I/O requests: max_sectors = %u "
+ "could be up to max_hw_sectors=%u\n",
+ obd->obd_name, mnt->mnt_sb->s_id,
+ q->max_sectors, q->max_hw_sectors);
+
uuid_ptr = fsfilt_uuid(obd, obd->u.obt.obt_sb);
if (uuid_ptr != NULL) {
class_uuid_unparse(uuid_ptr, &uuid);
--
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