Date: Wed, 1 Apr 2015 13:05:02 -0700 From: Jim Harris <jim.harris@gmail.com> To: Alan Somers <asomers@freebsd.org> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Tobias Oberstein <tobias.oberstein@gmail.com>, Michael Fuckner <michael@fuckner.net>, Konstantin Belousov <kib@freebsd.org> Subject: Re: NVMe performance 4x slower than expected Message-ID: <CAJP=Hc-RNVuhPePg7bnpmT4ByzyXs_CNvAs7Oy7ntXjqhZYhCQ@mail.gmail.com> In-Reply-To: <CAOtMX2jVwMHSnQfphAF%2Ba2%2Bo7eLp62nHmUo4t%2BEahrXLWReaFQ@mail.gmail.com> References: <551BC57D.5070101@gmail.com> <CAOtMX2jVwMHSnQfphAF%2Ba2%2Bo7eLp62nHmUo4t%2BEahrXLWReaFQ@mail.gmail.com>
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On Wed, Apr 1, 2015 at 7:42 AM, Alan Somers <asomers@freebsd.org> wrote: > On Wed, Apr 1, 2015 at 4:16 AM, Tobias Oberstein > <tobias.oberstein@gmail.com> wrote: > > Hi, > > > > I am testing performance of a NVMe device (Intel P3700) using FIO at the > > block device level and get 4x slower performance than expected: > > > > 4kB Random Read > > > > Intel Datasheet FIO Measurement Match > > P3700 450,000 107,092 24% > > DC S3700 75,000 67,186 90% > > > > The 2nd line are results for an Intel DC S3700 for comparison (with this > > device, I do see the performance expected, but not for the P3700). > > > > Hardware: > > > > - 4 sockets, 48 core x86-64, 3TB RAM > > - 8 x Intel P3700 2TB > > - 12 x Intel DC S3700 800GB (via LSI HBAs) > > > > Software: > > > > FreeBSD 11 Current with patches (DMAR and ZFS patches, otherwise the box > > doesn't boot at all .. because of 3TB RAM and the amount of periphery). > > > Do you still have WITNESS and INVARIANTS turned on in your kernel > config? They're turned on by default for Current, but they do have > some performance impact. To turn them off, just build a > GENERIC-NODEBUG kernel . > > Could you also post full dmesg output as well as vmstat -i? > > > > > Complete info and test logs are here: > > > > > https://github.com/oberstet/scratchbox/blob/master/freebsd/cruncher/perftests.md > > > > Right now I am running Linux on the box (openSUSE 13.2). Using the exact > > same FIO control file, the values for the DC S3700 are very close to > > FreeBSD, but the values for the P3700 are much higher: > > > > > https://github.com/oberstet/scratchbox/blob/master/freebsd/cruncher/perftests.md#more-numbers-linux > > > > I am looking for tuning hints or general advice for FreeBSD and NVMe. > > > > I would like to go with FreeBSD (a major aspect is ZFS), but the > performance > > issues with NVMe might be a deal breaker. > > > > Cheers, > > /Tobias > > _______________________________________________ > > freebsd-hackers@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > > To unsubscribe, send any mail to " > freebsd-hackers-unsubscribe@freebsd.org" >
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