From fe29d807596ec9de4dadb58c153cc5e3a982bd5a Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@redhat.com>
Date: Tue, 20 Feb 2018 08:35:34 -0600
Subject: [PATCH] os/bluestore: trim cache every 50ms (instead of 200ms)

In small cache size situations trimming needs to be more frequent.  See
https://tracker.ceph.com/issues/22616

This isn't a complete solution: in very low memory situations an even lower
value would be needed, or perhaps bluestore_default_buffered_read=false.

Signed-off-by: Sage Weil <sage@redhat.com>
(cherry picked from commit 50eb2108bdf151c27fc32569f9503dbf82ae0fb9)
---
 src/common/options.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/common/options.cc b/src/common/options.cc
index a69880e07f6de..9c991fca8c78e 100644
--- a/src/common/options.cc
+++ b/src/common/options.cc
@@ -3458,7 +3458,7 @@ std::vector<Option> get_global_options() {
     .set_description("Preallocated buffer for inline shards"),
 
     Option("bluestore_cache_trim_interval", Option::TYPE_FLOAT, Option::LEVEL_ADVANCED)
-    .set_default(.2)
+    .set_default(.05)
     .set_description("How frequently we trim the bluestore cache"),
 
     Option("bluestore_cache_trim_max_skip_pinned", Option::TYPE_UINT, Option::LEVEL_DEV)
-- 
2.39.5