[Buildroot] [PATCH] package/netperf: move SITE so s.b.n

[Yann E. MORIN <yann.morin.1998@free.fr>]

Peter, All,

On 2021-06-07 22:22 +0200, Peter Korsgaard spake thusly:
> >>>>> "Arnout" == Arnout Vandecappelle <arnout@mind.be> writes:
>  >  Wouldn't it be possible to route sources.buildroot.org through cloudflare as well?
> It would, but there were some complications back when we set it up,
> E.G. you need to use cloudflares DNS servers and we didn't originally
> have control of the buildroot.org.
> 
> Only having cloudflare on one of the domains was also quite handy for
> comparing behaviour when debugging in the beginning.
> 
> But yeah, we should probably use the same setup for both domains now. We
> originally put Cloudflare in front because of bandwidth/latency issues
> with s.b.o for some users. Given that Cloudflare is a bit controversial,
> it is maybe worth checking if we should keep on using it or drop it.

I think we should keep s.b.n, and that we should keep it as the default
in all our settings: backup mirror, _SOURCES...

Also, I think we should keep s.b.o as uncached, so that we have a
fallback.

> According to the Cloudflare stats, ~45% of the requests are cached,
> saving ~1TB traffic/month.

I have really no idea whether a less-than-half cache-hit ratio is good
or not, especially for our use-case.

However, is this 45% ratio a hit ratio, or a volume ratio?

Also, how much of those are due to our autobuilders? To packages without
_SOURCES pointing to sbn (i.e. actual fallbacks)?

> Thomas, I think you had performance issues in the beginning, can you
> compare speed again?

Here are a few totally non-scientific tests, done on a machine that has
no caching proxy, and a direct 1Gbps connection to the internet; both
URLs where downloaded using wget:

http://sources.buildroot.net/linux/linux-cip-4.19.98-cip19-rt7.tar.gz (CDN)
  - first run (uncached?):  2021-06-08 18:21:12 (6.08 MB/s) - ?linux-cip-4.19.98-cip19-rt7.tar.gz? saved [161511299/161511299]
  - second run (cached?):   2021-06-08 18:21:20 (88.5 MB/s) - ?linux-cip-4.19.98-cip19-rt7.tar.gz? saved [161511299/161511299]

http://sources.buildroot.org/linux/linux-cip-4.19.98-cip19-rt7.tar.gz (direct)
  - first run (uncached?):  2021-06-08 18:22:40 (4.36 MB/s) - ?linux-cip-4.19.98-cip19-rt7.tar.gz? saved [161511299/161511299]
  - second run (cached?):   2021-06-08 18:23:00 (16.0 MB/s) - ?linux-cip-4.19.98-cip19-rt7.tar.gz? saved [161511299/161511299]
  - third run (cached?):    2021-06-08 18:24:00 (17.2 MB/s) - ?linux-cip-4.19.98-cip19-rt7.tar.gz? saved [161511299/161511299]

http://sources.buildroot.net/linux/linux-cip-4.19.98-cip19-rt7.tar.gz (CDN, again)
  - third run (cached?):    2021-06-08 18:24:17 (92.1 MB/s) - ?linux-cip-4.19.98-cip19-rt7.tar.gz? saved [161511299/161511299]

So, basically, the unseeded s.b.n is ~50% faster than unseeded s.b.o.
But once seeded s.b.n is ~20 times faster than unseeded s.b.o, and even
~6 times faster than seeded s.b.o.

So the CDN (s.b.n) does have a positive impact.

Regards,
Yann E. MORIN.

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