distfiles.macports.org slow

[Daniel J. Luke]

On Jul 7, 2008, at 10:34 PM, William Siegrist wrote:
> On Jul 7, 2008, at 6:22 PM, Ryan Schmidt wrote:
>> MacPorts trunk seems to like picking distfiles.macports.org to
>> download distfiles because its pings return fast, but actually
>> downloading files from it is slow, like less than 10KB/sec. Anyone
>> else seeing this?
>
> I just did a quick test and I get much better results. Obviously, to  
> my office is 5-10 MB/s which is expected since the servers are very  
> close to me. But even downloading to my personal machine at home  
> over a cable modem averaged around 1 MB/s.  There's probably a point  
> when you're too far away for pings to accurately model the bandwidth  
> between, but I think you should be getting something better than  
> 10KB/s anyway.


Maybe there's some ICMP filtering that's breaking PMTU discovery  
(which could be interfering with TCP window scaling):

[xeon:~] dluke% ping -s 1600 gandalf.geeklair.net
PING geeklair.net (129.250.34.2): 1600 data bytes
1608 bytes from 129.250.34.2: icmp_seq=0 ttl=51 time=90.470 ms
1608 bytes from 129.250.34.2: icmp_seq=1 ttl=51 time=74.231 ms
^C
--- gandalfgeeklair.net ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 74.231/82.350/90.470/8.119 ms

[xeon:~] dluke% ping -s 1600 distfiles.macports.org
PING alpha.macosforge.org (17.254.17.246): 1600 data bytes
^C
--- alpha.macosforge.org ping statistics ---
6 packets transmitted, 0 packets received, 100% packet loss

--
Daniel J. Luke
+========================================================+
| *---------------- dluke at geeklair.net ----------------* |
| *-------------- http://www.geeklair.net -------------* |
+========================================================+
|   Opinions expressed are mine and do not necessarily   |
|          reflect the opinions of my employer.          |
+========================================================+



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