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Date:      Fri, 14 Oct 2016 11:43:30 +0200
From:      Fabian Keil <freebsd-listen@fabiankeil.de>
To:        Michael Osipov <1983-01-06@gmx.net>
Cc:        freebsd-geom@freebsd.org
Subject:   Re: Abysmally slow write to geom class volume over network
Message-ID:  <20161014114330.396fe534@fabiankeil.de>
In-Reply-To: <636763f0-a732-18ba-262b-c3fc01f4342c@gmx.net>
References:  <33da0f73-48f1-4727-fe76-41343dc4955b@gmx.net> <18314f27-849b-31df-d88d-af64e89c133f@gmx.net> <346c7da7-02b2-ba34-1463-f3f0a5a3cd9a@rlwinm.de> <15e9cb94-7ad8-e547-b06a-699ce2250624@gmx.net> <20161013014143.GA1669@funkthat.com> <636763f0-a732-18ba-262b-c3fc01f4342c@gmx.net>

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Michael Osipov <1983-01-06@gmx.net> wrote:

> Am 2016-10-13 um 03:41 schrieb John-Mark Gurney:
> > Michael Osipov wrote this message on Wed, Oct 12, 2016 at 20:54
> > +0200: =20
> >> As if there is a bottleneck between socket read and geom write to FS.
> >>
> >> Is that better? =20
> >
> > Have you run gstat on the system to see if there is an IO bottle
> > neck?  Since you are using graid3, you want to look to see if
> > it's %busy is ~100, while the underlying components are not. =20
>=20
> This is hardly impossible because as soon as I start some SFTP transfer,=
=20
> all of my SSH sessions free or receive connetion timeout/abort.  Doing a=
=20
> SFTP from FreeBSD to FreeBSD gives me on both physical disks and RAID3=20
> volume a busy of zero to one perfect. In other terms, the drives are
> bored.

Try checking the FAIL and SLEEP columns in the "vmstat -z" output.

This could be related to:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D209680#c2

Fabian

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