ixgbe: Copybreak sooner to avoid get_page/put_page and offset change overhead

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This change makes it so that if only the first 256 bytes of a buffer are
used we just copy the data out and leave the offset and page count
unchanged. There are multiple advantages to this. First it allows us to
reuse the page much more in the case of pages larger than 4K. It also
allows us to avoid some expensive atomic operations in the form of
get_page/put_page. In perf I have seen CPU utilization for put_page drop
from 3.5% to 1.8% as a result of this patch when doing small packet routing,
and packet rates increased by about 3%.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>

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Alexander Duyck 2012-07-20 08:08:39 +00:00 • committed by Peter P Waskiewicz Jr

parent 19861ce24f

commit cf3fe7aca0

1 changed files with 17 additions and 15 deletions

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32

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

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