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d5aa3e6e0c
qemu/net
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Ladi Prosek d5aa3e6e0c 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>
2017-01-20 10:36:38 +08:00
..
checksum.c net: optimize checksum computation 2017-01-20 10:36:38 +08:00
clients.h net: use Netdev instead of NetClientOptions in client init 2016-07-19 13:21:08 +02:00
colo-compare.c trivial patches for 2016-10-28 2016-10-31 11:58:30 +00:00
colo.c filter-rewriter: rewrite tcp packet to keep secondary connection 2016-09-27 17:54:22 +08:00
colo.h filter-rewriter: rewrite tcp packet to keep secondary connection 2016-09-27 17:54:22 +08:00
dump.c qapi: Change Netdev into a flat union 2016-07-19 20:18:02 +02:00
eth.c net: fix incorrect argument to iov_to_buf 2016-07-18 16:16:52 +08:00
filter-buffer.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
filter-mirror.c char: remove explicit_fe_open, use a set_handlers argument 2016-10-24 15:46:10 +02:00
filter-replay.c record/replay: add network support 2017-01-06 10:38:00 +08:00
filter-rewriter.c colo-proxy: fix memory leak 2016-10-26 09:58:02 +08:00
filter.c qtail: clean up direct access to tqe_prev field 2016-09-13 19:08:41 +02:00
hub.c qapi: Change Netdev into a flat union 2016-07-19 20:18:02 +02:00
hub.h net: fix qemu_flush_queued_packets() in presence of a hub 2013-02-27 16:10:23 +01:00
l2tpv3.c qapi: Change Netdev into a flat union 2016-07-19 20:18:02 +02:00
Makefile.objs record/replay: add network support 2017-01-06 10:38:00 +08:00
net.c net: fix sending of data with -net socket, listen backend 2016-11-15 15:36:21 +08:00
netmap.c qapi: Change Netdev into a flat union 2016-07-19 20:18:02 +02:00
queue.c net: Clean up includes 2016-02-04 17:41:30 +00:00
slirp.c slirp: fix CharDriver breakage 2016-11-02 09:28:56 +01:00
socket.c net: fix sending of data with -net socket, listen backend 2016-11-15 15:36:21 +08:00
tap_int.h Clean up header guards that don't match their file name 2016-07-12 16:19:16 +02:00
tap-aix.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
tap-bsd.c tap-bsd: OpenBSD uses tap(4) now 2016-10-26 09:57:59 +08:00
tap-haiku.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
tap-linux.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
tap-linux.h Clean up decorations and whitespace around header guards 2016-07-12 16:20:46 +02:00
tap-solaris.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
tap-win32.c qapi: Change Netdev into a flat union 2016-07-19 20:18:02 +02:00
tap.c tap: Allow specifying a bridge 2016-09-27 17:54:22 +08:00
trace-events net: split colo_compare_pkt_info into two trace events 2016-10-28 19:00:15 +01:00
util.c net: Clean up includes 2016-02-04 17:41:30 +00:00
util.h all: Clean up includes 2016-02-23 12:43:05 +00:00
vde.c qapi: Change Netdev into a flat union 2016-07-19 20:18:02 +02:00
vhost-user.c char: remove explicit_fe_open, use a set_handlers argument 2016-10-24 15:46:10 +02:00