Hi Erick, one question about the PGW: is it a policer or a shaper that you have installed? Also, have you tried to run a ping session before and in parallel to the curl sessions?
Luca On Thu, Nov 19, 2020 at 2:15 PM <erik.tarald...@telenor.com> wrote: > Update: > The 5G router was connected to a new base station. Now the limiting > factor of throughput is the policer on the PGW in mobile core, not the > radio link itself. The SIM card used is limited to 30Mbit/s. This > scenario favours the new server. I have attached graphs comparing radio > link limited vs PGW policer results, and a zoomed in graph of the policer > > > We have Huawei RAN and Ericsson RAN, rate limited and not rate limited > subscriptions, 4G and 5G access, and we are migrating to a new core with > new PGW (policer). Starting to be a bit of a matrix to set up tests for. > > > -Erik > > > ________________________________________ > Fra: Jesper Dangaard Brouer <bro...@redhat.com> > Sendt: 17. november 2020 16:07 > Til: Taraldsen Erik; Priyaranjan Jha > Kopi: bro...@redhat.com; ncardw...@google.com; bloat@lists.bufferbloat.net > Emne: Re: [Bloat] BBR implementations, knobs to turn? > > On Tue, 17 Nov 2020 10:05:24 +0000 <erik.tarald...@telenor.com> wrote: > > > Thank you for the response Neal > > Yes. And it is impressive how many highly qualified people are on the > bufferbloat list. > > > old_hw # uname -r > > 5.3.0-64-generic > > (Ubuntu 19.10 on xenon workstation, integrated network card, 1Gbit > > GPON access. Used as proof of concept from the lab at work) > > > > > > new_hw # uname -r > > 4.18.0-193.19.1.el8_2.x86_64 > > (Centos 8.2 on xenon rack server, discrete 10Gbit network card, > > 40Gbit server farm link (low utilization on link), intended as fully > > supported and run service. Not possible to have newer kernel and > > still get service agreement in my organization) > > Let me help out here. The CentOS/RHEL8 kernels have a huge amount of > backports. I've attached a patch/diff of net/ipv4/tcp_bbr.c changes > missing in RHEL8. > > It looks like these patches are missing in CentOS/RHEL8: > [1] https://git.kernel.org/torvalds/c/78dc70ebaa38aa3 > [2] https://git.kernel.org/torvalds/c/a87c83d5ee25cf7 > > Could missing patch [1] result in the issue Erik is seeing? > (It explicitly mentions improvements for WiFi...) > > -- > Best regards, > Jesper Dangaard Brouer > MSc.CS, Principal Kernel Engineer at Red Hat > LinkedIn: http://www.linkedin.com/in/brouer > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat >
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