--- zzzz-none-000/linux-2.6.39.4/drivers/usb/storage/scsiglue.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/drivers/usb/storage/scsiglue.c	2021-11-10 13:38:17.000000000 +0000
@@ -550,8 +550,14 @@
 	/* lots of sg segments can be handled */
 	.sg_tablesize =			SCSI_MAX_SG_CHAIN_SEGMENTS,
 
+#if defined (CONFIG_AVM_KERNEL)
+	/* == AVM/WKR 20160914 - further transfer speed optimization == */
+	/* limit the total size of a transfer to 512 KB to reduce USB irqs */
+	.max_sectors =                  1024,
+#else
 	/* limit the total size of a transfer to 120 KB */
 	.max_sectors =                  240,
+#endif
 
 	/* merge commands... this seems to help performance, but
 	 * periodically someone should test to see which setting is more