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Commit 128c6e2e authored by Linas Vepstas's avatar Linas Vepstas Committed by Jeff Garzik
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spidernet: turn off descriptor chain end interrupt. 



At some point, the transmit descriptor chain end interrupt (TXDCEINT)
was turned on. This is a mistake; and it damages small packet
transmit performance, as it results in a huge storm of interrupts.
Turn it off.

Signed-off-by: default avatarLinas Vepstas <linas@austin.ibm.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent c3d1182a

drivers/net/spider_net.h

+2 −2
Original line number Diff line number Diff line
@@ -222,6 +222,7 @@ 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_GDTDCEIDIS | \

                                       SPIDER_NET_GDTBSTA



#define SPIDER_NET_DMA_TX_FEND_VALUE	0x00030003
@@ -332,8 +333,7 @@ enum spider_net_int2_status { 
	SPIDER_NET_GRISPDNGINT

};



#define SPIDER_NET_TXINT	( (1 << SPIDER_NET_GDTFDCINT) | \

                             (1 << SPIDER_NET_GDTDCEINT) )

#define SPIDER_NET_TXINT	(1 << SPIDER_NET_GDTFDCINT)



/* We rely on flagged descriptor interrupts */

#define SPIDER_NET_RXINT	( (1 << SPIDER_NET_GDAFDCINT) )