[PATCH] spidernet: poor network performance

Correct a problem seen on later kernels running the NetPIPE application.
Specifically, NetPIPE would begin running very slowly at the 1533 packet
size.  It was determined that Spidernet slowed with an idle DMA engine.

Signed-off-by: James K Lewis <jklewis@us.ibm.com>
Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index 9dd282346e1c44b3e1833e4647c731521bab01de..cef7e6671c49b658d9ce618eafad16213b7b09f9 100644 (file)
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -1633,7 +1633,7 @@ spider_net_enable_card(struct spider_net_card *card)
                             SPIDER_NET_INT2_MASK_VALUE);
 
        spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
-                            SPIDER_NET_GDTBSTA | SPIDER_NET_GDTDCEIDIS);
+                            SPIDER_NET_GDTBSTA);
 }
 
 /**

diff --git a/drivers/net/spider_net.h b/drivers/net/spider_net.h
index cb85cbb3d92d38250e28af203d4a774917224d42..3e196df29790dcd50795c6872bb64e5e7d08389d 100644 (file)
--- a/drivers/net/spider_net.h
+++ b/drivers/net/spider_net.h
@@ -24,7 +24,7 @@
 #ifndef _SPIDER_NET_H
 #define _SPIDER_NET_H
 
-#define VERSION "1.5 A"
+#define VERSION "1.6 A"
 
 #include "sungem_phy.h"
 
@@ -217,8 +217,7 @@ extern char spider_net_driver_name[];
 #define SPIDER_NET_GDTBSTA             0x00000300
 #define SPIDER_NET_GDTDCEIDIS          0x00000002
 #define SPIDER_NET_DMA_TX_VALUE        SPIDER_NET_TX_DMA_EN | \
-                                       SPIDER_NET_GDTBSTA | \
-                                       SPIDER_NET_GDTDCEIDIS
+                                       SPIDER_NET_GDTBSTA
 
 #define SPIDER_NET_DMA_TX_FEND_VALUE   0x00030003
 
@@ -328,7 +327,8 @@ enum spider_net_int2_status {
        SPIDER_NET_GRISPDNGINT
 };
 
-#define SPIDER_NET_TXINT       ( (1 << SPIDER_NET_GDTFDCINT) )
+#define SPIDER_NET_TXINT       ( (1 << SPIDER_NET_GDTFDCINT) | \
+                             (1 << SPIDER_NET_GDTDCEINT) )
 
 /* We rely on flagged descriptor interrupts */
 #define SPIDER_NET_RXINT       ( (1 << SPIDER_NET_GDAFDCINT) )