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e1000e: save skb counts in TX to avoid cache misses

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In e1000_tx_map, precompute number of segements and bytecounts which
are derived from fields in skb; these are stored in buffer_info.  When
cleaning tx in e1000_clean_tx_irq use the values in the associated
buffer_info for statistics counting, this eliminates cache misses
on skb fields.

Signed-off-by: Tom Herbert <therbert@google.com>
Acked-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
2010-05-05 14:02:27 +00:00
committed by David S. Miller
parent 4447957a82
commit 9ed318d546
2 changed files with 11 additions and 9 deletions
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2
drivers/net/e1000e/e1000.h
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@@ -189,6 +189,8 @@ struct e1000_buffer {
unsigned long time_stamp;
u16 length;
u16 next_to_watch;
unsigned int segs;
unsigned int bytecount;
u16 mapped_as_page;
};
/* Rx */