[MacPorts] #49452: rsync.macports.org is very slow

[MacPorts]

#49452: rsync.macports.org is very slow
-----------------------------+---------------------
  Reporter:  lpancescu@…     |      Owner:  admin@…
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by lpancescu@…):

 I just realized, packet loss could lead to a low transfer rate or even to
 a stalled TCP connection (due to the TCP sliding window protocol). Let's
 test that theory:

 * French mirror
 {{{
 $ ping -q -c 100 lil.fr.rsync.macports.org
 PING lil.fr.rsync.macports.org (87.98.244.45): 56 data bytes

 --- lil.fr.rsync.macports.org ping statistics ---
 100 packets transmitted, 100 packets received, 0.0% packet loss
 round-trip min/avg/max/stddev = 35.509/36.627/41.092/0.756 ms
 }}}
 * Canadian mirror
 {{{
 $ ping -q -c 100 ykf.ca.rsync.macports.org
 PING mirror.csclub.uwaterloo.ca (129.97.134.71): 56 data bytes

 --- mirror.csclub.uwaterloo.ca ping statistics ---
 100 packets transmitted, 100 packets received, 0.0% packet loss
 round-trip min/avg/max/stddev = 123.321/125.046/134.289/1.397 ms
 }}}
 * Korean mirror
 {{{
 $ ping -q -c 100 cjj.kr.rsync.macports.org
 PING ftp.kaist.ac.kr (103.22.220.133): 56 data bytes

 --- ftp.kaist.ac.kr ping statistics ---
 100 packets transmitted, 100 packets received, 0.0% packet loss
 round-trip min/avg/max/stddev = 308.116/546.142/815.002/149.790 ms
 }}}
 * Seattle, USA
 {{{
 $ ping -q -c 100 sea.us.rsync.macports.org
 PING mirror.pnl.gov (192.101.102.2): 56 data bytes

 --- mirror.pnl.gov ping statistics ---
 100 packets transmitted, 100 packets received, 0.0% packet loss
 round-trip min/avg/max/stddev = 188.007/189.587/190.805/0.392 ms
 }}}
 * Main server - San Francisco, USA
 {{{
 $ ping -q -c 100 rsync.macports.org
 PING rsync.macports.org (17.251.224.217): 56 data bytes

 --- rsync.macports.org ping statistics ---
 100 packets transmitted, 94 packets received, 6.0% packet loss
 round-trip min/avg/max/stddev = 181.538/184.057/261.316/8.502 ms
 }}}

 The main server is the only one with a relatively high packet loss. Test
 with 1000 packages, for better accuracy:
 {{{
 $ ping -q -c 1000 rsync.macports.org
 PING rsync.macports.org (17.251.224.217): 56 data bytes

 --- rsync.macports.org ping statistics ---
 1000 packets transmitted, 958 packets received, 4.2% packet loss
 round-trip min/avg/max/stddev = 181.073/182.229/190.005/0.674 ms
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/49452#comment:4>
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