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-   -   request: remove "gd.tuwien.ac.at" from mirror-lists (http://www.linux-archive.org/fedora-development/707316-request-remove-gd-tuwien-ac-mirror-lists.html)

Reindl Harald 09-25-2012 07:12 PM

request: remove "gd.tuwien.ac.at" from mirror-lists
 
Am 25.09.2012 18:34, schrieb Kevin Fenzi:
> On Tue, 25 Sep 2012 13:54:34 +0200
> Reindl Harald <h.reindl@thelounge.net> wrote:
>
>> since some weeks "gd.tuwien.ac.at" is creeping around
>> 2-30 KB/second and i am sitting on 100 MBit WAN
>>
>> currently 68 BYTE per second on a test-vm
>>
>> since yum does no longer support switching a mirror
>> with STRG+C https://bugzilla.redhat.com/show_bug.cgi?id=860181
>> this such mirrors should be removed or yum become a setting
>> that mirrors where a download creeps for longer than 10 seconds
>> below a user configured value taht it will be skipped
>
> Well, the thing is that it may be slow from where you are, but is fast
> for many others. ;(

i am here at vienna ona glass fiber

* 4 hops UPC
* 4 hops Vienna University Computer Center - ACOne

and the same from a 100 Mbit UPC-Fiber-Power at the
other end of the city - not realistic that it would be
faster anywhere in austria

normally nto a big deal, but sicne the new "yum" does
no longer support STRG+C to switch the mirror painful

traceroute to gd.tuwien.ac.at (192.35.244.50), 30 hops max, 60 byte packets
1 router (10.0.0.1) 1.698 ms 1.850 ms 1.833 ms
2 81-223-227-65.zwischennetz.inode.at (81.223.227.65) 2.141 ms 2.110 ms 2.070 ms
3 at-vie-sk11-pe02-vl-2070.upc.at (84.116.228.233) 2.650 ms 2.731 ms 2.804 ms
4 at-vie15a-rd1-vl-2043.aorta.net (84.116.228.129) 2.206 ms 2.276 ms 2.407 ms
5 213.46.173.125 (213.46.173.125) 2.779 ms at-vie05b-ri2-xe-0-2-0.aorta.net (213.46.173.14) 2.589 ms
213.46.173.129 (213.46.173.129) 2.774 ms

6 tengige0-1-0-1.core21.aco.net (193.203.0.2) 3.052 ms 1.970 ms 2.143 ms
7 vlan73.wien21.aco.net (193.171.23.41) 1.949 ms 2.267 ms 2.366 ms
8 vlan72.wien2.aco.net (193.171.23.21) 2.576 ms 2.611 ms 2.747 ms
9 border.kom.tuwien.ac.at (193.171.13.10) 2.776 ms 2.803 ms 2.907 ms
10 gd.tuwien.ac.at (192.35.244.50) 2.789 ms 2.891 ms 2.923 ms

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Adam Williamson 09-26-2012 12:14 AM

request: remove "gd.tuwien.ac.at" from mirror-lists
 
On Tue, 2012-09-25 at 10:34 -0600, Kevin Fenzi wrote:
> On Tue, 25 Sep 2012 13:54:34 +0200
> Reindl Harald <h.reindl@thelounge.net> wrote:
>
> > since some weeks "gd.tuwien.ac.at" is creeping around
> > 2-30 KB/second and i am sitting on 100 MBit WAN
> >
> > currently 68 BYTE per second on a test-vm
> >
> > since yum does no longer support switching a mirror
> > with STRG+C https://bugzilla.redhat.com/show_bug.cgi?id=860181
> > this such mirrors should be removed or yum become a setting
> > that mirrors where a download creeps for longer than 10 seconds
> > below a user configured value taht it will be skipped
>
> Well, the thing is that it may be slow from where you are, but is fast
> for many others. ;(

I think some of Harald's other suggestions in the mail are pretty good,
though. It does seem like yum could try harder to throw out slow
mirrors. It is a bit annoying when you're sitting on a 50Mb/sec
connection getting about 200Kb/sec from some sclerotic mirror...
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Daniel Veillard 09-26-2012 04:05 AM

request: remove "gd.tuwien.ac.at" from mirror-lists
 
On Tue, Sep 25, 2012 at 05:14:58PM -0700, Adam Williamson wrote:
> On Tue, 2012-09-25 at 10:34 -0600, Kevin Fenzi wrote:
[...]
> I think some of Harald's other suggestions in the mail are pretty good,
> though. It does seem like yum could try harder to throw out slow
> mirrors. It is a bit annoying when you're sitting on a 50Mb/sec
> connection getting about 200Kb/sec from some sclerotic mirror...

So just imagine when you have 4Mbps and getting not even half a kbps
from the server and unable to even kill that update because if you do
the damn thing will restart from scratch from the same server and at
the same speed. That's the current situation here ! 200Kb/sec is
very fast compared to what yum serves us, there are server that fast
but yum will stick indefinitely with slow servers. And a fast server
today will be a slow one tomorrow depending on the ISP own evaluation
of the traffic pattern.

Daniel

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Reindl Harald 09-26-2012 08:02 AM

request: remove "gd.tuwien.ac.at" from mirror-lists
 
Am 26.09.2012 06:05, schrieb Daniel Veillard:
> On Tue, Sep 25, 2012 at 05:14:58PM -0700, Adam Williamson wrote:
>> On Tue, 2012-09-25 at 10:34 -0600, Kevin Fenzi wrote:
> [...]
>> I think some of Harald's other suggestions in the mail are pretty good,
>> though. It does seem like yum could try harder to throw out slow
>> mirrors. It is a bit annoying when you're sitting on a 50Mb/sec
>> connection getting about 200Kb/sec from some sclerotic mirror...
>
> So just imagine when you have 4Mbps and getting not even half a kbps
> from the server and unable to even kill that update because if you do
> the damn thing will restart from scratch from the same server and at
> the same speed. That's the current situation here ! 200Kb/sec is
> very fast compared to what yum serves us, there are server that fast
> but yum will stick indefinitely with slow servers. And a fast server
> today will be a slow one tomorrow depending on the ISP own evaluation
> of the traffic pattern.

yes, and that is why statistics of mirrors are meaningsless

because of this fact my idea to give us a config-option
"dear yum, if the selected mirror provides lower than
500 KB/sek try another one because my line can 12 MB/sec"

keep also in mind that a usually fast mirror may have too
much load and that is why he is so slow - one reason more
to switch ASAP to another one

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Kevin Kofler 09-28-2012 08:47 PM

request: remove "gd.tuwien.ac.at" from mirror-lists
 
Reindl Harald wrote:
> i am here at vienna ona glass fiber
>
> * 4 hops UPC
> * 4 hops Vienna University Computer Center - ACOne
>
> and the same from a 100 Mbit UPC-Fiber-Power at the
> other end of the city - not realistic that it would be
> faster anywhere in austria

FYI, try hardcoding mirror.karneval.cz, that sits on UPC Czech Republic and
has a very fast connection to UPC Austria. Other fast mirrors are the Czech
academic ones (muni.cz in Brno and cuni.cz in Prague). The Austrian mirrors
all suck, unfortunately. :-(

Kevin Kofler

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Zdenek Pavlas 10-03-2012 02:23 PM

request: remove "gd.tuwien.ac.at" from mirror-lists
 
On Wed Sep 26 08:02:05, Reindl Harald wrote:

> yes, and that is why statistics of mirrors are meaningsless
> because of this fact my idea to give us a config-option
> "dear yum, if the selected mirror provides lower than
> 500 KB/sek try another one because my line can 12 MB/sec"

FWIW, we've increased the low speed limit in urlgrabber from
1 to 1000 B/sec. This should fix the most pathological cases.
When speed falls below this limit for 30s, download is aborted
as if it timed out, and next mirror is used. Each timeout also
halves the mirror's estimated speed so it will very likely be
avoided next time.

https://admin.fedoraproject.org/updates/FEDORA-2012-14928/python-urlgrabber-3.9.1-21.fc18

The timeout value (30s by default) could be adjusted in yum.conf.
Low speed limit is hardcoded, but there's a simple patch to add
it to yum.conf.. could be merged if necessary.

http://lists.baseurl.org/pipermail/yum-devel/2012-September/009634.html
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Reindl Harald 10-03-2012 02:28 PM

request: remove "gd.tuwien.ac.at" from mirror-lists
 
Am 03.10.2012 16:23, schrieb Zdenek Pavlas:
> On Wed Sep 26 08:02:05, Reindl Harald wrote:
>
>> yes, and that is why statistics of mirrors are meaningsless
>> because of this fact my idea to give us a config-option
>> "dear yum, if the selected mirror provides lower than
>> 500 KB/sek try another one because my line can 12 MB/sec"
>
> FWIW, we've increased the low speed limit in urlgrabber from
> 1 to 1000 B/sec. This should fix the most pathological cases.
> When speed falls below this limit for 30s, download is aborted
> as if it timed out, and next mirror is used. Each timeout also
> halves the mirror's estimated speed so it will very likely be
> avoided next time.

sounds good thank you

> https://admin.fedoraproject.org/updates/FEDORA-2012-14928/python-urlgrabber-3.9.1-21.fc18
>
> The timeout value (30s by default) could be adjusted in yum.conf.
> Low speed limit is hardcoded, but there's a simple patch to add
> it to yum.conf.. could be merged if necessary.
>
> http://lists.baseurl.org/pipermail/yum-devel/2012-September/009634.html

i think it would make sense to make it configureable

this way someone is able to use his maximum bandwidth on large upgrades
and mirrors which as example have a free bandwidth of > 8 MB/Sec are
not overloaded and those users wouldn't it make worser on slower ones

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Daniel Veillard 10-08-2012 06:52 AM

request: remove "gd.tuwien.ac.at" from mirror-lists
 
On Wed, Oct 03, 2012 at 10:23:48AM -0400, Zdenek Pavlas wrote:
> On Wed Sep 26 08:02:05, Reindl Harald wrote:
>
> > yes, and that is why statistics of mirrors are meaningsless
> > because of this fact my idea to give us a config-option
> > "dear yum, if the selected mirror provides lower than
> > 500 KB/sek try another one because my line can 12 MB/sec"
>
> FWIW, we've increased the low speed limit in urlgrabber from
> 1 to 1000 B/sec. This should fix the most pathological cases.
> When speed falls below this limit for 30s, download is aborted
> as if it timed out, and next mirror is used. Each timeout also
> halves the mirror's estimated speed so it will very likely be
> avoided next time.
>
> https://admin.fedoraproject.org/updates/FEDORA-2012-14928/python-urlgrabber-3.9.1-21.fc18

Cool, thanks !

Daniel



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