Dns seems high
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- Re: Dns seems high
Re: Dns seems high
18-12-2013 10:11 PM
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...To make more wide-ranging changes will unfortunately have to wait until major scaling at which point a lot of things will be addressed, so please bear with us.
In the meantime, if this exact same config is deployed across the rest of the cachedns estate then performance will be much improved.
[Moderator's note by Dick (Strat): Full quote of preceding post removed, as per Forum Rule]
And again, as an aside - i'm pretty bored of having posts moderated for merely answering questions now when other forum users don't get the same treatment. Just an observation mods.
Re: Dns seems high
18-12-2013 10:28 PM
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Quote from: Chris Unfortunately the downside of using a load balancer to hand out requests vs. anycast and a massively shared cache on the backend
Would a single cache be that much bigger?
I would have thought the vast majority of entries would be the same in all 10 caches.
Do you have any data to clarify this?
Sorry Chris but I'm not seeing anything at this end to say the new resolver is a step forward.
Re: Dns seems high
18-12-2013 10:58 PM
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Quote from: Chris
In the meantime, if this exact same config is deployed across the rest of the cachedns estate then performance will be much improved.
Well, there is only 1 way to find out if it will be a success i guess. I'm also adding a view from the south below, taken @22:45 ish.
Re: Dns seems high
18-12-2013 11:57 PM
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Re: Dns seems high
19-12-2013 5:14 PM
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Quote from: ejs Linux, Fedora 20, the clue is in: #
; <<>> DiG 9.9.4-RedHat-9.9.4-8.fc20 <<>> @212.159.6.9 www.gnu.org +tries=1
(RedHat / Fedora, fc20 = Fedora 20)
Here are some more:
http://ejs1920.users.sourceforge.net/more-dig+adflag.pcap
They aren't all 0x80, that capture was mainly me trying to spot any patterns with what causes the responses to be marked 0x20 - it seems to depend on which server (9 and 10 vs. 49 and 50) and what hostname you look up.
This should be fixed now and in titanium.
Enterprise Architect - Network & OSS
Plusnet Technology
Re: Dns seems high
26-01-2014 4:24 PM
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Nameserver Response Time (ms)
min/avg/max/stdev/retries
212.159.6.9 18.82/20.72/22.02/1.13/0
212.159.6.10 18.56/19.00/19.58/0.42/0
212.159.13.49 18.51/19.00/19.52/0.24/1
212.159.13.50 18.29/18.86/19.78/0.55/0
Nameserver Response Time (ms)
min/avg/max/stdev/retries
212.159.6.9 18.28/18.83/19.57/0.51/0
212.159.6.10 18.11/18.51/18.92/0.32/0
212.159.13.49 18.24/18.75/19.28/0.37/0
212.159.13.50 18.96/19.19/19.51/0.21/1
Nameserver Response Time (ms)
min/avg/max/stdev/retries
212.159.6.9 18.70/19.21/19.73/0.38/0
212.159.6.10 18.15/18.70/19.54/0.47/0
212.159.13.49 18.16/18.83/19.57/0.52/1
212.159.13.50 18.57/18.97/19.56/0.45/0
Nameserver Response Time (ms)
min/avg/max/stdev/retries
212.159.6.9 18.22/19.64/22.64/1.69/1
212.159.6.10 18.35/18.85/19.31/0.39/0
212.159.13.49 18.02/18.70/19.55/0.52/0
212.159.13.50 18.20/18.89/19.54/0.46/0
Re: Dns seems high
26-01-2014 5:02 PM
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One current problematic hostname for the PN DNS servers seems to be radar.cedexis.com (some advertising / tracking rubbish on some website) which gets a SERVFAIL response much of the time (but not always).
There should be very little point in testing each of 212.159.6.9, 212.159.6.10, 212.159.13.49 and 212.159.13.50 - they are all effectively the same.
Re: Dns seems high
26-01-2014 5:14 PM
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I assume dns_bench is testing against google.com which is what i'm using. I think that timeout equates to 2000ms
results from dns top give me
Queries: 0 new, 133 total Sun Jan 26 17:07:24 2014
Source Query Name Count % cum%
------------ ------------------------- --------- ------ ------
192.168.0.15 www.google.com 132 99.2 99.2
192.168.0.15 30.0.168.192.in-addr.arpa 1 0.8 100.0
I've been having trouble streaming as well, I've just not managed to put my finger on it as yet, so i just threw the net wide just incase anybody else is having trouble at all.
Edit: As you say it makes no odds testing 2 of the same, however, nothing else i'm testing is having any issue dns wise.
Nameserver Response Time (ms)
min/avg/max/stdev/retries
212.159.6.9 19.30/19.59/19.76/0.19/1
212.159.6.10 18.40/18.89/19.46/0.37/0
208.67.222.222 17.90/18.79/19.55/0.64/0
208.67.222.220 18.20/18.45/18.67/0.15/0
208.67.222.123 17.97/18.39/19.02/0.36/0
208.67.220.123 18.20/18.70/19.29/0.40/0
8.8.8.8 23.39/25.24/29.50/2.18/0
8.8.4.4 24.27/24.66/24.99/0.31/0
4.2.2.1 17.94/18.32/19.05/0.41/0
4.2.2.6 18.13/18.39/18.88/0.27/0
192.168.0.254 19.54/19.70/19.93/0.14/0
192.168.0.15 0.61/0.62/0.67/0.02/0
Nameserver Response Time (ms)
min/avg/max/stdev/retries
208.67.222.222 17.90/18.20/18.67/0.28/0
208.67.222.220 17.94/18.23/18.38/0.16/0
208.67.222.123 18.15/18.40/18.73/0.22/0
208.67.220.123 18.02/18.24/18.49/0.18/0
8.8.8.8 23.57/24.37/26.36/1.03/0
8.8.4.4 23.78/24.35/25.15/0.54/0
4.2.2.1 17.88/18.16/18.66/0.29/0
4.2.2.6 18.02/18.32/18.50/0.16/0
192.168.0.254 19.26/19.73/20.21/0.35/0
192.168.0.15 0.60/0.61/0.61/0.00/0
212.159.6.9 18.55/19.13/19.88/0.39/1
212.159.6.10 18.35/19.08/19.80/0.58/0
Re: Dns seems high
26-01-2014 9:37 PM
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Things looking bad (again)...
"In The Beginning Was The Word, And The Word Was Aardvark."
Re: Dns seems high
26-01-2014 10:15 PM
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I'd nearly forgot all about my whitebox
Re: Dns seems high
27-01-2014 12:05 AM
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Nameserver Response Time (ms) min/avg/max/stdev/retries
212.159.6.9 18.00/18.42/18.73/0.27/1
212.159.6.10 17.67/18.42/18.87/0.42/0
208.67.222.222 18.00/18.24/18.60/0.20/0
208.67.222.220 18.03/18.19/18.40/0.17/0
208.67.222.123 17.91/18.12/18.34/0.15/0
208.67.220.123 17.91/18.10/18.36/0.19/0
8.8.8.8 23.73/24.04/24.27/0.18/0
8.8.4.4 23.69/24.09/24.42/0.26/0
4.2.2.1 17.74/18.07/18.38/0.23/0
4.2.2.6 17.73/18.01/18.38/0.25/0
192.168.0.254 19.26/19.57/19.80/0.18/0
192.168.0.15 0.60/0.63/0.70/0.04/0
Re: Dns seems high
27-01-2014 9:30 AM
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Ex-Broadband Service Manager
Re: Dns seems high
27-01-2014 3:48 PM
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Ex-Broadband Service Manager
Re: Dns seems high
27-01-2014 3:56 PM
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Re: Dns seems high
27-01-2014 8:38 PM
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--- bbc.co.uk ping statistics ---101 packets transmitted, 101 received, 0% packet loss, time 100152ms
rtt min/avg/max/mdev = 17.424/18.476/23.675/0.980 ms
Nameserver Response Time (ms)
min/avg/max/stdev/retries
212.159.6.9 17.90/18.64/19.06/0.44/1
212.159.6.10 18.21/18.88/19.39/0.43/0
208.67.222.222 18.25/18.49/18.61/0.14/0
208.67.222.220 17.89/18.15/18.35/0.18/0
208.67.222.123 17.68/18.36/19.30/0.53/0
208.67.220.123 18.48/18.70/18.83/0.13/0
8.8.8.8 23.50/24.12/24.81/0.50/0
8.8.4.4 23.62/24.29/25.30/0.57/0
4.2.2.1 18.14/19.16/20.44/0.98/0
4.2.2.6 17.74/18.20/18.62/0.30/0
Edit: A bit more info added
--- bbc.co.uk ping statistics ---
590 packets transmitted, 590 received, 0% packet loss, time 589238ms
rtt min/avg/max/mdev = 16.983/18.052/23.176/0.676 ms
(0.0.0.0) Mon Jan 27 20:54:55 2014
Keys: Help Display mode Restart statistics Order of fields quit
Packets Pings
Host Loss% Snt Last Avg Best Wrst StDev
1. 192.168.0.254 0.0% 230 24.8 40.1 1.6 100.5 25.2
2. lo0-central10.pcl-ag06.plus.net 0.0% 230 16.7 26.9 16.4 291.4 31.8
3. link-a-central10.pcl-gw01.plus.n 0.0% 229 17.2 17.6 16.5 35.2 1.3
4. xe-10-3-0.pcl-cr01.plus.net 0.0% 229 36.6 18.8 16.1 55.7 5.0
5. po2.pcl-gw01.plus.net 0.0% 229 17.1 17.7 16.3 83.9 4.6
6. vl63.pcl-lb01.plus.net 0.0% 229 18.2 18.3 16.8 31.0 1.2
7. cdns01.plus.net 0.0% 229 17.1 18.3 16.7 25.2 1.1
(0.0.0.0) Mon Jan 27 20:55:23 2014
Keys: Help Display mode Restart statistics Order of fields quit
Packets Pings
Host Loss% Snt Last Avg Best Wrst StDev
1. 192.168.0.254 0.0% 394 18.7 51.4 0.7 100.3 32.3
2. lo0-central10.pcl-ag06.plus.net 0.0% 394 21.3 27.3 16.4 504.9 38.5
3. link-a-central10.pcl-gw01.plus.n 0.0% 394 17.3 17.6 16.1 34.8 1.7
4. xe-10-3-0.pcl-cr01.plus.net 0.0% 394 18.4 18.0 16.1 50.1 3.7
5. ae1.ptw-cr01.plus.net 0.0% 394 17.8 18.2 16.2 47.3 3.5
6. te9-4.ptn-gw01.plus.net 0.0% 394 20.4 17.6 16.5 32.2 1.1
7. gi5-1.peh-cr02.plus.net 0.0% 394 24.7 26.5 23.6 92.6 5.4
8. po5.peh-cr01.plus.net 0.0% 394 30.5 26.4 23.9 58.0 2.7
9. vlan2658.peh-elb02.plus.net 0.0% 393 25.9 27.6 24.2 86.7 4.3
10. portal.plus.net 0.0% 393 26.1 28.1 24.5 79.2 6.1
No sign of packet loss in that lot.
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