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614b4f5d0f
linux/arch/s390
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Heiko Carstens 614b4f5d0f s390/checksum: make ip_fast_csum() faster 
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>
2020-08-26 18:47:20 +02:00
..
appldata s390/appldata: use struct_size() helper 2020-06-29 16:32:34 +02:00
boot mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
configs s390: update defconfigs 2020-07-01 20:02:38 +02:00
crypto mm, treewide: rename kzfree() to kfree_sensitive() 2020-08-07 11:33:22 -07:00
hypfs fs_parse: fold fs_parameter_desc/fs_parameter_spec 2020-02-07 14:48:37 -05:00
include s390/checksum: make ip_fast_csum() faster 2020-08-26 18:47:20 +02:00
kernel s390/ptrace: fix storage key handling 2020-08-17 13:17:14 +02:00
kvm mm/gup: remove task_struct pointer for all gup code 2020-08-12 10:58:04 -07:00
lib s390/test_unwind: fix possible memleak in test_unwind() 2020-08-11 18:16:16 +02:00
mm - Allow s390 debug feature to handle finally more than 256 CPU numbers, instead 2020-08-13 12:38:32 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-08-05 20:13:21 -07:00
oprofile s390/unwind: introduce stack unwind API 2019-05-02 13:54:11 +02:00
pci s390/pci: fix PF/VF linking on hot plug 2020-08-17 13:17:34 +02:00
purgatory .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
scripts s390/build: use size command to perform empty .bss check 2019-08-08 14:36:53 +02:00
tools .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Kbuild s390/numa: move code to arch/s390/kernel 2020-08-11 18:16:55 +02:00
Kconfig s390/time: remove select CLOCKSOURCE_VALIDATE_LAST_CYCLE again 2020-08-11 18:16:48 +02:00
Kconfig.debug treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile kbuild: remove cc-option test of -ffreestanding 2020-07-07 11:13:10 +09:00