Date: Tue, 07 Apr 2015 14:39:37 +0200 From: Tobias Oberstein <tobias.oberstein@gmail.com> To: Konstantin Belousov <kostikbel@gmail.com> Cc: "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: <5523D009.7070302@gmail.com> In-Reply-To: <20150404234839.GM2379@kib.kiev.ua> References: <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> <551C6B62.7080205@gmail.com> <CAJP=Hc_6BFpoWqkSRyZaxsN1Zn=-D14CXOQjMb4zjnZRKhMb-g@mail.gmail.com> <551D4E5F.9090400@gmail.com> <20150402221029.GE2379@kib.kiev.ua> <551FC7B3.80203@gmail.com> <20150404234839.GM2379@kib.kiev.ua>
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>>>> Something is severely wrong. It seems, there might be multiple issues >>>> (not only NVMe). And this is after already running with 3 patches to >>>> make it even boot. >>> The speed of dd already looks wrong. >> >> Yes. > Try some simple checks for the performance anomalies. E.g., verify the > raw memory bandwidth, check that it is in the expected range. Quick search > popped up the following tool, e.g.: > https://zsmith.co/bandwidth.html Here are results for those 2 machines (single socket 4 core E3, quad socket 48 core E7): https://github.com/oberstet/scratchbox/blob/master/freebsd/cruncher/results/freebsd_memperf.md https://raw.githubusercontent.com/oberstet/scratchbox/master/freebsd/cruncher/results/bw_4core.bmp https://raw.githubusercontent.com/oberstet/scratchbox/master/freebsd/cruncher/results/bw_48core.bmp
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