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Message-ID: <20070607200152.GQ16077@austin.ibm.com> Date: Thu, 7 Jun 2007 15:01:52 -0500 From: linas@...tin.ibm.com (Linas Vepstas) To: Jeff Garzik <jgarzik@...ox.com> Cc: cbe-oss-dev@...abs.org, netdev@...r.kernel.org, Nathan J Lee <njlee@...ibm.com>, Ling Shao <shaol@...ibm.com>, Utz Bacher <utz.bacher@...ibm.com>, Zhen Bo Zhu <zhuzb@...ibm.com>, Zhu Han <hanzhu@...ibm.com>, Jens Osterkamp <Jens.Osterkamp@...ibm.com>, Yan Qi Wang <yqwang@...ibm.com> Subject: [PATCH 17/18] 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 2007-06-07 11:56:31.000000000 -0500 +++ linux-2.6.22-rc1/drivers/net/spider_net.h 2007-06-07 11:56:36.000000000 -0500 @@ -227,6 +227,7 @@ 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 @@ -337,8 +338,7 @@ 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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