Extremely slow response from US server site via PN BB - no problem over 4G : Network bottleneck?
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Extremely slow response from US server site via PN BB - no problem over 4G : Network bottleneck?
15-02-2019 11:27 PM
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Slightly odd issue.
I regularly (several times a day) fetch data from an American university server.
The data is got over https using API access into their server, via a small Python program. We literally fetch only a few hundred bytes of data each time.
The University claim that their response time, from receiving a request to transmitting the response, is about 3 seconds. I have no reason to doubt this.
Over my PN connection (standard ADSL, no speed problems, get about 18MB/s), the response time for this activity, start to end, is never less than 13 seconds, and can be up to a 70 seconds or more.
If however I set my 'phone up as a WiFi hotspot and connect via 4G (Tesco/O2), and thus bypass the PN network altogether, I consistently get response times around 5-7 seconds.
Doesn't sound a big problem, but this single data fetch is on a critical path as part of a larger function, and it slows the entire process down by a factor of at least 7.
So, I conclude there's a bottleneck somewhere.
Can one of the PN network team pick this up please? It's driving me a bit nutty.
I can provide some MTR (traceroute) or ping or tcpdump data, or whatever's needed - I'm on Linux btw.
Re: Extremely slow response from US server site via PN BB - no problem over 4G : Network bottleneck?
16-02-2019 2:10 PM
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Re: Extremely slow response from US server site via PN BB - no problem over 4G : Network bottleneck?
16-02-2019 5:58 PM
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thanks very much Adam.
Here's an MTR trace from last night.
I've PM'd you the target address separately.
Re: Extremely slow response from US server site via PN BB - no problem over 4G : Network bottleneck?
18-02-2019 10:43 AM
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Re: Extremely slow response from US server site via PN BB - no problem over 4G : Network bottleneck?
18-02-2019 11:56 PM
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Sorry Adam only just seen this.
Unfortunately, I can't get a traceroute when I'm on 4G - or rather I can, but it only returns the first hop.
After a bit of googling, it does seem this is a often a problem with 4G telecoms providers - variously attributed to CGNAT, ICMP blocking or possibly Brexit.
There doesn't seem much I can do about this, sorry
Re: Extremely slow response from US server site via PN BB - no problem over 4G : Network bottleneck?
19-02-2019 10:08 AM
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Re: Extremely slow response from US server site via PN BB - no problem over 4G : Network bottleneck?
19-02-2019 6:11 PM
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Re: Extremely slow response from US server site via PN BB - no problem over 4G : Network bottleneck?
20-02-2019 9:06 AM
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No worries, the response times there look a lot better. It does look like there maybe some kind of routing issue. I want to take a look at this with one of our net ops team so bear with me and I'll get back to you ASAP when we've been able to review it.
Re: Extremely slow response from US server site via PN BB - no problem over 4G : Network bottleneck?
20-02-2019 9:12 AM
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Thanks Adam.
Didn't expect there to be an instant answer as it does seem to be off at the edge of the known universe
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