Re: Master is still *really* slow:-/

[Philippe Troin <phil@fifi.org>]

Jason Gunthorpe <jgg@gpu.srv.ualberta.ca> writes:

> On 4 Nov 1998, Philippe Troin wrote:
> 
> > Well, I don't go through sprintlink at all *and* I have a lot of
> > packet loss...
> > 
> > For comparison:
> >                                             Packets            Pings
> > Hostname                                 %Loss  Rcv Snt  Best  Avg  Worst
> >  1. tantale.fifi.org                        0% 101 101    0    1      4
> >  2. sjw-pm3-01.blueneptune.com              0% 101 101  145  155    231
> >  3. sjw-t1-01.blueneptune.com               0% 101 101  131  154    198
> >  4. main-106.sjc.above.net                  0% 101 101  143  199    798
> >  5. core2-main.sjc.above.net                0% 100 101  140  162    387
> >  6. savvis-above-45Mbps.sjc.above.net       0% 100 100  140  158    278
> >  7. atm9-0-031.CR-1.DllsTX.savvis.net       6%  94 100  186  219    603
> >  8. IGLOBAL-1.DllsTX.savvis.net             8%  92 100  187  195    244
> >  9. master.debian.org                       7%  93 100  189  201    407
> > 
> > IMHO, savvis is the culprit. The problem started when master started
> > using savvis too...
> 
> Savvis has this fun way of asymetrically routing. Try mtr from master to
> you, it will be different. This IMHO is one of the leading causes of
> troubles. We can't do anything without some hard reproducable evidence
> then we can bop the savvis people and they will fix it.

Yeah, you got it... The packets on thei way back go through
sprintlink... and experience a bit of packet loss:

Hostname                                 %Loss  Rcv Snt  Best  Avg  Worst
 1. outrout.novare.net                      0%  109 109     0    1      5
 2. GA0FF.GR-1.DllsTX.savvis.net            6%  103 109     1   24    512
 3. sl-gw13-fw-10-0-T3.sprintlink.net       5%  104 109     4   10    329
 4. sl-bb11-fw-2-2.sprintlink.net           6%  103 109     2    5      8
 5. sl-bb22-ana-5-0.sprintlink.net          8%  101 109    26   29     69
 6. sl-bb21-ana-9-0.sprintlink.net          8%  101 109    26   29     69
 7. sl-bb10-sj-0-0.sprintlink.net           8%  101 109    34   37     69
 8. sl-gw2-sj-0-0-0-155M.sprintlink.net     9%  100 109    35   41    177
 9. sl-abovenet-3-0.sprintlink.net         11%   98 109    53   64    216
10. main2-core2.sjc.above.net              16%   92 109    54   61     92
11. gw.blueneptune.above.net               13%   94 108    54   62     92
12. sjw-pm3-01.blueneptune.com             17%   90 108    57   64     78
13. ppp-gw.fifi.org                        17%   90 108   209  259    591
14. ceramic.fifi.org                       13%   92 108   243  263    595

Now that's real assymetric routing :-)

Looks like something's broken to me (sprint ?).

Phil.