kernel/linux.git/arch/s390/lib/csum-partial.c, branch linux-7.0.yLinux kernel stable tree (mirror)https://git.radix-linux.su/kernel/linux.git/atom?h=linux-7.0.y2024-02-16T13:30:17+00:00s390/checksum: provide csum_partial_copy_nocheck()2024-02-16T13:30:17+00:00Heiko Carstenshca@linux.ibm.com2024-02-03T10:45:23+00:00urn:sha1:dcd3e1de9d17dc43dfed87a9fc814b9dec508043
With csum_partial(), which reads all bytes into registers it is easy to
also implement csum_partial_copy_nocheck() which copies the buffer while
calculating its checksum.
For a 512 byte buffer this reduces the runtime by 19%. Compared to the old
generic variant (memcpy() + cksm instruction) runtime is reduced by 42%).
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
s390/checksum: provide vector register variant of csum_partial()2024-02-16T13:30:17+00:00Heiko Carstenshca@linux.ibm.com2024-02-03T10:45:22+00:00urn:sha1:cb2a1dd589a0ce97429bf2beeb560e5b030c2ccc
Provide a faster variant of csum_partial() which uses vector registers
instead of the cksm instruction.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>