Date: Sun, 28 Mar 2021 06:48:30 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net> To: Kurt Jaeger <pi@freebsd.org> Cc: Kevin Bowling <kevin.bowling@kev009.com>, freebsd-net@freebsd.org Subject: Re: Which cpu/mainboard for fast routing (bgp, full tables) ? Message-ID: <202103281348.12SDmUcX063041@gndrsh.dnsmgr.net> In-Reply-To: <YGBRtHBbImA9C2T5@fc.opsec.eu>
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> Hi! > > > That class of processor has fairly limited memory bandwidth. An E5 v3 or > > greater should get you what you want, although finding a system that makes > > good use of available PCIe lanes with a single socket configuration can > > sometimes be maddening. AMD may have a variety of nice parts for this > > application, although I don?t have any personal experience with routing on > > such hardware. > > Thanks -- I searched for a pair of boxes in my infra with those > specs, found them: > > Intel(R) Xeon(R) CPU E5-1620 v3 @ 3.50GHz > 82599ES 10-Gigabit SFI/SFP+ Network Connection > and > Intel(R) Xeon(R) CPU E5-1620 v4 @ 3.50GHz > 82599ES 10-Gigabit SFI/SFP+ Network Connection > > and tested. Roughly the same performance, if we use only one > connection. These CPU's have a quad channel memory controller, to achive anything close to the maximal memory bandwidth of 68BG/s you need to have all 4 banks of the memory occupied with identical DIMM's, and preferable DDR4 2133 or DDR4 2400. Also iirc the 82599ES uses the iflib driver code, and I am not sure how performant that is. The Mellanox and Chelsio cards are preferable in places that high speed is needed. > > iperf3 -c <destip> > > The boxes were able to reach 10gbit, if we run 3 threads in parallel: > > iperf3 -c -P 3 <destip> > > So I have some area where I can investigate further. I am not sure if hyperthreading has any effect on this type setup, I usually disable it on anything I want to be "performant" unless I see some great need for more threads. > pi@FreeBSD.org +49 171 3101372 Now what ? -- Rod Grimes rgrimes@freebsd.org
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