Date: Wed, 28 Mar 2018 15:41:45 -0700 From: "K. Macy" <kmacy@freebsd.org> To: christian russell <christian.baltini@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: Current state of Intel XL710 40G NIC ixl performance Message-ID: <CAHM0Q_PTegwXmvBpSYhXSGdvdTW9sY=QHS0giAqsZee=WiB6bQ@mail.gmail.com> In-Reply-To: <CAESVrtyFJ2W-jmmpq4a-uaCaXN8K3XLuFenW7%2Bu8=LgL2xn8rg@mail.gmail.com> References: <CAESVrtyFJ2W-jmmpq4a-uaCaXN8K3XLuFenW7%2Bu8=LgL2xn8rg@mail.gmail.com>
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> On a single-client basis the fastest rates we see are around 5 Gbps. > Hitting this server from multiple boxes we see peaks of 20 Gbps at the very > highest. More frequently things top off around 13 Gbps. These numbers are > coming from iperf tests. We are seeing similar numbers with direct > point-to-point as well as switched topologies. > > These threads from 2015 describe similar issues but fizzled out: > https://lists.freebsd.org/pipermail/freebsd-net/2015-May/042273.html > https://lists.freebsd.org/pipermail/freebsd-net/2015-October/043584.html > > Is there very particular tuning required to get these cards working at > proper speed? Any insights? This is unfortunate. The iflib version of the ixl driver performed quite well under NFLX load several years ago. I even saw 39Gbps single stream with v6. Fortunately, Intel will eventually be pushing the iflib version to HEAD. -M
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