distfiles.macports.org slow

[William Siegrist]

On Jul 7, 2008, at 9:16 PM, Daniel J. Luke wrote:

> 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
>


I enabled all ICMP types. Does that help?

-Bill

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