Date: Mon, 17 Mar 2014 08:16:43 -0700 From: jv <jv@yeaguy.com> To: freebsd-questions@freebsd.org Subject: Re: Monitor IO performance Message-ID: <532711DB.4020606@yeaguy.com> In-Reply-To: <CALf6cgY-if5RH9y19aQf8DTV=6Kkux%2B18H5aHkMNsJK-knEMUw@mail.gmail.com> References: <CALf6cgY-if5RH9y19aQf8DTV=6Kkux%2B18H5aHkMNsJK-knEMUw@mail.gmail.com>
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Here is a comparison for you: [vic@yeaguy ~] uname -a FreeBSD yeaguy.com 10.0-RELEASE FreeBSD 10.0-RELEASE #0 r260789: Thu Jan 16 22:34:59 UTC 2014 root@snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64 [vic@yeaguy ~] sudo ioping -R /tmp --- /tmp (ufs /dev/ada0p4) ioping statistics --- 1.5 k requests completed in 3.0 s, 516 iops, 2.0 MiB/s min/avg/max/mdev = 187 us / 1.9 ms / 12.5 ms / 2.8 ms [vic@yeaguy ~] On 3/17/2014 7:42 AM, n j wrote: > Hi, > > I'm having issues with IO performance on a 10.0-RELEASE VPS. I suspect my > provider might have oversold the resources. I'd like to collect some > statistics before I send them a complaint. I'd welcome any help or pointers > to links/documentation on how to best test IO performance and collect IO > statistics on a prolonged period (e.g. run something every 2 hours for a > few days or something like that) and actually make some sense out of those > numbers. Right now, I'm thinking about running ioping > (/usr/ports/sysutils/ioping) as I find its output quite clear, but I'm not > sure how good an indicator it is without a benchmark to compare it to. > > Here's a sample run, these numbers look abysmally low to me: > # ioping -R /tmp > --- /tmp (ufs /dev/ada0s1a) ioping statistics --- > 66 requests completed in 3.0 s, 21 iops, 87.8 KiB/s > min/avg/max/mdev = 756 us / 45.6 ms / 681.1 ms / 128.2 ms > > P.S. The problems started some time ago and might also be related to the > 10.0-RELEASE upgrade. I can't really pinpoint if the problems started with > the upgrade or not, but would appreciate info if anyone else experienced > any IO performance degradation after the upgrade. > > Thanks,
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