diff options
| author | Anton Blanchard <anton@samba.org> | 2010-08-02 20:09:52 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-09-02 14:07:30 +1000 |
| commit | fdd374b62ca4df144c0138359dcffa83df7a0ea8 (patch) | |
| tree | 8f52a7648adb30012b01589892b71913cdbc4cd7 /arch/powerpc/lib/Makefile | |
| parent | 9b83ecb0a3cf1bf7ecf84359ddcfb9dd49646bf2 (diff) | |
| download | linux-fdd374b62ca4df144c0138359dcffa83df7a0ea8.tar.gz linux-fdd374b62ca4df144c0138359dcffa83df7a0ea8.tar.xz | |
powerpc: Optimise 64bit csum_partial_copy_generic and add csum_and_copy_from_user
We use the same core loop as the new csum_partial, adding in the
stores and exception handling code. To keep things simple we do all the
exception fixup in csum_and_copy_from_user. This wrapper function is
modelled on the generic checksum code and is careful to always calculate
a complete checksum even if we only copied part of the data to userspace.
To test this I forced checksumming on over loopback and ran socklib (a
simple TCP benchmark). On a POWER6 575 throughput improved by 19% with
this patch. If I forced both the sender and receiver onto the same cpu
(with the hope of shifting the benchmark from being cache bandwidth limited
to cpu limited), adding this patch improved performance by 55%
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/lib/Makefile')
| -rw-r--r-- | arch/powerpc/lib/Makefile | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile index 5bb89c828070..ad4a36848f25 100644 --- a/arch/powerpc/lib/Makefile +++ b/arch/powerpc/lib/Makefile @@ -17,7 +17,8 @@ obj-$(CONFIG_PPC32) += div64.o copy_32.o obj-$(CONFIG_HAS_IOMEM) += devres.o obj-$(CONFIG_PPC64) += copypage_64.o copyuser_64.o \ - memcpy_64.o usercopy_64.o mem_64.o string.o + memcpy_64.o usercopy_64.o mem_64.o string.o \ + checksum_wrappers_64.o obj-$(CONFIG_XMON) += sstep.o ldstfp.o obj-$(CONFIG_KPROBES) += sstep.o ldstfp.o obj-$(CONFIG_HAVE_HW_BREAKPOINT) += sstep.o ldstfp.o |