Use larger buffer when reading binary and relay logs

- Should speed up replication

1 files changed, 6 insertions, 0 deletions

diff --git a/sql/log.h b/sql/log.h
index 063513fe908..58e681985eb 100644
--- a/sql/log.h
+++ b/sql/log.h
@@ -295,6 +295,12 @@ enum enum_log_type { LOG_UNKNOWN, LOG_NORMAL, LOG_BIN };
 enum enum_log_state { LOG_OPENED, LOG_CLOSED, LOG_TO_BE_OPENED };
 
 /*
+  Use larger buffers when reading from and to binary log
+  We make it one step smaller than 64K to account for malloc overhead.
+*/
+#define LOG_BIN_IO_SIZE MY_ALIGN_DOWN(65536-1, IO_SIZE)
+
+/*
   TODO use mmap instead of IO_CACHE for binlog
   (mmap+fsync is two times faster than write+fsync)
 */