From: Aravind Ramesh <aravind.ramesh@wdc.com>
Date: Wed, 5 Jul 2023 16:58:24 +0000 (+0200)
Subject: crimson/os/seastore/zbd: increase padding byte buffer size.
X-Git-Tag: v18.2.1~126^2~1
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=edc126d166f263cc90f37601851bfcb6e56dde8b;p=ceph.git

crimson/os/seastore/zbd: increase padding byte buffer size.

Before closing a segment, seastore writes a tail information
at the end of the segment, since ZBD zones are serially write
required, if a zone is not fully written to the end, it writes
padding bytes till the tail section.
Increase the size of write chunks to reduce the number of writes.

Signed-off-by: Aravind Ramesh <aravind.ramesh@wdc.com>
(cherry picked from commit 181e6394014dcdca3d1d0cea5f35e92545cb84b9)
---

diff --git a/src/crimson/os/seastore/segment_manager/zbd.cc b/src/crimson/os/seastore/segment_manager/zbd.cc
index 97344b858a90..4f8103d785f8 100644
--- a/src/crimson/os/seastore/segment_manager/zbd.cc
+++ b/src/crimson/os/seastore/segment_manager/zbd.cc
@@ -16,7 +16,7 @@ SET_SUBSYS(seastore_device);
 #define SECT_SHIFT	9
 #define RESERVED_ZONES 	1
 // limit the max padding buf size to 1MB
-#define MAX_PADDING_SIZE 1048576
+#define MAX_PADDING_SIZE 4194304
 
 using z_op = crimson::os::seastore::segment_manager::zbd::zone_op;
 template <> struct fmt::formatter<z_op>: fmt::formatter<std::string_view> {