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Date: Mon, 11 Jun 2007 13:29:03 -0500 From: linas@...tin.ibm.com (Linas Vepstas) To: Jeff Garzik <jeff@...zik.org> Cc: Michael Ellerman <michael@...erman.id.au>, netdev@...r.kernel.org, cbe-oss-dev@...abs.org Subject: [PATCH 5/15] 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: Linas Vepstas <linas@...tin.ibm.com> ---- drivers/net/spider_net.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6.22-rc1/drivers/net/spider_net.h =================================================================== --- linux-2.6.22-rc1.orig/drivers/net/spider_net.h 2007-06-08 17:40:02.000000000 -0500 +++ linux-2.6.22-rc1/drivers/net/spider_net.h 2007-06-08 17:40:05.000000000 -0500 @@ -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) ) - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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