From owner-freebsd-stable@freebsd.org  Fri Nov 27 09:21:47 2015
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Date: Fri, 27 Nov 2015 11:21:36 +0200
From: Ivan Klymenko <fidaj@ukr.net>
To: "Eugene M. Zheganin" <emz@norma.perm.ru>
Cc: freebsd-stable <freebsd-stable@freebsd.org>
Subject: Re: high disk %busy, while almost nothing happens
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On Fri, 27 Nov 2015 09:47:57 +0500
"Eugene M. Zheganin" <emz@norma.perm.ru> wrote:

> Hi.
> 
> On 27.11.2015 01:37, Ivan Klymenko wrote:
> > On Thu, 26 Nov 2015 14:19:18 +0500
> > "Eugene M. Zheganin" <emz@norma.perm.ru> wrote:
> >  
> >> Hi.
> >>
> >> I'm using FreeBSD 10.1-STABLE as an application server, last week
> >> I've noticed that disks are always busy while gstat shows that the
> >> activity measured in iops/reads/writes is low, form my point of
> >> view: 
> > Hi.
> >
> > You have processes with STATE zio->i ?  
> hard to tell now, since I've managed to solve the problem. If I
> encounter this again, with the state you mentioned, what could it
> mean ?
> 

No idea, but some friends faced with a similar problem in the
11-CURRENT after some changes - then with the MFC could face with a
similar problem in the 10-STABLE systems. In any case, such a
regression was significantly visible.