Date: Tue, 10 Nov 2015 12:56:54 +0100 From: Marko Turk <markoml@markoturk.info> To: "Eugene M. Zheganin" <emz@norma.perm.ru> Cc: FreeBSD <freebsd-stable@freebsd.org> Subject: Re: zfs, mc, mcview and files opening Message-ID: <20151110115654.GA1949@vps.markoturk.info> In-Reply-To: <5641BFC8.9050207@norma.perm.ru> References: <5641BFC8.9050207@norma.perm.ru>
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Hi,
On Tue, Nov 10, 2015 at 02:58:32PM +0500, Eugene M. Zheganin wrote:
> Hi.
>=20
> my midnight commander is terribly slow at vieweing files with mcview.
> Opening of a file of approximately 10 megabytes takes about 30-40
> seconds. This isn't related with the compression setting, %busy wait or
> pool properties- I tested on various machines, it's fully reproducible.
> This lag appears on files about 1.5 megs in size, and the lag time is
> pretty constant. From my observation, it's the following syscall that's
> blocking:
>=20
> fstat(4,{ mode=3Dp--------- ,inode=3D41,size=3D0,blksize=3D4096 }) =3D 0 =
(0x0)
> (observed using `truss mcview maillog`)
>=20
> If the file is viewed not by mcview (i.e. it is of a special type and
> viewed by the special utility, or mcview is simply not used - for
> example more opens same file without lag) - the file is opening fast as
> always. When mcview is involved - lag appears. In the same time I've
> never seen this lag on filesystems other than zfs.
Is this happening on every ZFS FreeBSD install or just some of them? I'm
running ZFS on FreeBSD 10-STABLE and I don't see this problem (even for
much larger files).
BR,
Marko
> And the most
> beautiful detail is that this lag is repeatable on multiple opens of
> same file - though you can expect that it will be only first time that
> would be that slow, it doesn't happen - same pause occurs on sequential
> opens.
>=20
> Who's issue is this ?
> Can some workaround be used ?
>=20
> Thanks.
> Eugene.
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