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| author |   Ladi Prosek <lprosek@redhat.com> | 2017-01-06 09:08:53 +0100 |
|---|---|---|
| committer |   Jason Wang <jasowang@redhat.com> | 2017-01-20 10:36:38 +0800 |
| commit | d5aa3e6e0cd6259003790769c448d4fbb5b5c810 (patch) | |
| tree | 5594b798a8766fcb589c8f7a4fbd42253b7bba86 /scripts/qapi-commands.py | |
| parent | docs: Fix description of the sentence (diff) | |
| download | qemu-d5aa3e6e0cd6259003790769c448d4fbb5b5c810.tar.xz qemu-d5aa3e6e0cd6259003790769c448d4fbb5b5c810.zip | |
net: optimize checksum computation
Very simple loop optimization with a significant performance impact.
Microbenchmark results, modern x86-64:
buffer size | speed up
------------+---------
1500 | 1.7x
64 | 1.5x
8 | 1.15x
Microbenchmark results, POWER7:
buffer size | speed up
------------+---------
1500 | 5x
64 | 3.3x
8 | 1.13x
There is a lot of room for further improvement at the expense of
code complexity - aligned multibyte reads, LE/BE considerations,
architecture-specific optimizations, etc. This patch still keeps
things simple and readable.
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Reviewed-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'scripts/qapi-commands.py')
0 files changed, 0 insertions, 0 deletions