From 57a7e5778ea52f25fc69cc763ed0bde3c3fce6b7 Mon Sep 17 00:00:00 2001
From: gevaerts <gevaerts@a1c6a512-1295-4272-9138-f99709370657>
Date: Wed, 20 May 2009 16:57:17 +0000
Subject: [PATCH] Don't force double-buffering for sd devices. They apparently
 are not faster with it, ans possibly actually slower

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20999 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/usbstack/usb_storage.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/firmware/usbstack/usb_storage.c b/firmware/usbstack/usb_storage.c
index 0d0622175..b49831101 100644
--- a/firmware/usbstack/usb_storage.c
+++ b/firmware/usbstack/usb_storage.c
@@ -53,10 +53,16 @@
  * wouldn't buy us anything.
  * Due to being the double-buffering system used, using a smaller write buffer
  * ends up being more efficient. Measurements have shown that 24k to 28k is
- * optimal
+ * optimal, except for sd devices that apparently don't gain anything from
+ * double-buffering
  */
 #define READ_BUFFER_SIZE (1024*64)
+
+#if (CONFIG_STORAGE & STORAGE_SD)
+#define WRITE_BUFFER_SIZE (1024*64)
+#else
 #define WRITE_BUFFER_SIZE (1024*24)
+#endif
 
 #define ALLOCATE_BUFFER_SIZE (2*MAX(READ_BUFFER_SIZE,WRITE_BUFFER_SIZE))
 
-- 
2.11.4.GIT