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614b4f5d0f
Convert ip_fast_csum() so it doesn't call csum_partial(), but instead open code the checksum calculation. The problem with csum_partial() is that it makes use of the cksm instruction, which has high startup costs and therefore is only very fast if used on larger memory regions. IPv4 headers however are small in size (5-16 32-bit words). The open coded variant calculates the checksum in ~30% of the time compared to the old variant (z14, march=z196). Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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| crypto | ||
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| kernel | ||
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| lib | ||
| mm | ||
| net | ||
| oprofile | ||
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| purgatory | ||
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| Kbuild | ||
| Kconfig | ||
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| Makefile | ||