Date: Fri, 10 Apr 2015 18:07:48 +0200 From: Tobias Oberstein <tobias.oberstein@gmail.com> To: Adrian Chadd <adrian@freebsd.org> Cc: Konstantin Belousov <kostikbel@gmail.com>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Michael Fuckner <michael@fuckner.net>, Jim Harris <jim.harris@gmail.com>, Alan Somers <asomers@freebsd.org> Subject: Re: NVMe performance 4x slower than expected Message-ID: <5527F554.2030806@gmail.com> In-Reply-To: <CAJ-VmonecBDemkfS=3nV2jiuJfOFJg7bZOacxOKXvTWktxBd9A@mail.gmail.com> References: <551BC57D.5070101@gmail.com> <CAOtMX2jVwMHSnQfphAF%2Ba2%2Bo7eLp62nHmUo4t%2BEahrXLWReaFQ@mail.gmail.com> <CAJP=Hc-RNVuhPePg7bnpmT4ByzyXs_CNvAs7Oy7ntXjqhZYhCQ@mail.gmail.com> <551C5A82.2090306@gmail.com> <20150401212303.GB2379@kib.kiev.ua> <CAJP=Hc87FMYCrQYGfAtefQ8PLT3WtnvPfPSppp3zRF-0noQR9Q@mail.gmail.com> <CAJP=Hc-WLKe3%2BDQ=2o21CY=aaQAjADrzEfnD7NVO1Cotu4vcGg@mail.gmail.com> <5526EA33.6090004@gmail.com> <CAJ-VmonecBDemkfS=3nV2jiuJfOFJg7bZOacxOKXvTWktxBd9A@mail.gmail.com>
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Hi Adrian, > Dell has graciously loaned me a bunch of hardware to continue doing FWIW, Dell has a roughly comparable system: Dell R920. But they don't have Intel NVMe's on their menu, only Samsung (and FusionIO, but that's not NVMe). > NUMA development on, but I have no NVMe hardware. I'm hoping people at The 8 NVMe PCIe SSDs in the box we're deploying are a key feature of this system (will be a data-warehouse). A single NVMe probably won't have triggered (all) issues we experienced. We are using the largest model (2TB), and this amounts to 50k bucks for all eight. The smallest model (400GB) is 1.5k, so 12k in total. > Intel can continue kicking along any desires for NUMA that they > require. (Which they have, fwiw.) It's already awesome that Intel has senior engineers working on FreeBSD driver code! And it would underline Intel's Open-source commitment and tech leadership if they donated a couple of these beefy NVMes. The specs are incredible, but extracing all the performance is non-trivial .. Cheers, /Tobias
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