[Bug 10322] Slow Performance over Network rsync

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=10322

--- Comment #8 from roland <devzero at web.de> 2013-12-24 13:26:50 UTC ---
now things getting really crazy.

if i _remove_ the mentioned commit from rsync 3.1.0,  it gives a speedup from
~30mb/s to about 60 mb/s !!!

so with the transition from 3.0.8 to 3.0.9 avoiding usage of socketpair() on
cygwin gives a speed benefit , but forcing usage of socketpair() with 3.1.0 by
removing the cygwin ifdefs nearly doubles speed.  

i double-checked. scratching my head now.....



w/o socketpair():
test at roterpc /cygdrive/c/Users/test/Downloads
$ rsync -av --progress android-x86-4.3-20130725.iso tmp/
sending incremental file list
android-x86-4.3-20130725.iso
    208,666,624 100%   32.29MB/s    0:00:06 (xfr#1, to-chk=0/1)

sent 208,717,687 bytes  received 35 bytes  27,829,029.60 bytes/sec
total size is 208,666,624  speedup is 1.00


with socketpair():

test at roterpc /cygdrive/c/Users/test/Downloads
$ rsync -av --progress android-x86-4.3-20130725.iso tmp/
sending incremental file list
android-x86-4.3-20130725.iso
    208,666,624 100%   59.70MB/s    0:00:03 (xfr#1, to-chk=0/1)

sent 208,717,687 bytes  received 35 bytes  37,948,676.73 bytes/sec
total size is 208,666,624  speedup is 1.00

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