Date: Tue, 18 Mar 2014 09:20:51 +0100 From: n j <nino80@gmail.com> To: User Questions <freebsd-questions@freebsd.org> Subject: Re: Monitor IO performance Message-ID: <CALf6cgZ%2BMvkV4gUd_Nv710NGwc1xKhhvUCNpLpQB01Gvo9HLog@mail.gmail.com> In-Reply-To: <532711DB.4020606@yeaguy.com> References: <CALf6cgY-if5RH9y19aQf8DTV=6Kkux%2B18H5aHkMNsJK-knEMUw@mail.gmail.com> <532711DB.4020606@yeaguy.com>
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On Mon, Mar 17, 2014 at 4:16 PM, jv <jv@yeaguy.com> wrote: > 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 ~] Thanks for that. Although various systems could probably range from first-class enterprise storage level to the cheap (oversold) VPS level, this still shows a tremendous difference in performance. Here is today's run: --- /tmp (ufs /dev/ada0s1a) ioping statistics --- 352 requests completed in 4.1 s, 86 iops, 345.9 KiB/s min/avg/max/mdev = 9 us / 11.6 ms / 1.5 s / 85.1 ms What I find especially troublesome is the maximum request time of 1.5s (yesterday's run 681ms). Also the mean deviation seems way too big (85.1ms, yesterday 128.2ms - this is Internet-level latency). I guess I'll have to talk to my VPS provider, though I regret not having taken these statistics before the 10.0 upgrade as well. Regards, -- Nino
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