rds: more FMRs are faster

When we add more FMRs, we flush them less often and so we go faster.
Signed-off-by: Chris Mason <chris.mason@oracle.com>

net/rds/ib.h

@@ -9,7 +9,7 @@
 #include "rdma_transport.h"
 
 #define RDS_FMR_SIZE			256
-#define RDS_FMR_POOL_SIZE		4096
+#define RDS_FMR_POOL_SIZE		8192
 
 #define RDS_IB_MAX_SGE			8
 #define RDS_IB_RECV_SGE 		2