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Date:      Thu, 23 Nov 2006 01:09:31 -0500
From:      Kris Kennaway <kris@obsecurity.org>
To:        Dieter <freebsd@sopwith.solgatos.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: processes not getting fair share of available disk I/O (was: Re: TCP parameters and interpreting tcpdump output )
Message-ID:  <20061123060929.GA49798@xor.obsecurity.org>
In-Reply-To: <200611230341.DAA04594@sopwith.solgatos.com>
References:  <20061123023733.GA46545@xor.obsecurity.org> <200611230341.DAA04594@sopwith.solgatos.com>

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On Wed, Nov 22, 2006 at 07:41:46PM +0000, Dieter wrote:

> > oad
> > > > > > have been trimmed from your email.
> > > > >=3D3D20
> > > > > In telnet window 1:
> > > > >=3D3D20
> > > > > cd /disk1/
> > > > > cp -ip very_big_file /disk2/bar/	(the workload)
> > > > >=3D3D20
> > > > > In telnet window 2:
> > > > >=3D3D20
> > > > > time ls /disk3/foo1/  (make sure time and ls are cached in memory)
> > > > > time ls /disk3/foo2/  (see timing numbers above)
> > > > > time ls /disk2/       (see timing numbers above)
> > > > >=3D3D20
> > > > > The /disk2/ directory is small, only contains 3 directories and .=
snap
> > > > >=3D3D20
> > > > > Would the cp into /disk2/bar/ lock the /disk2/ directory?
> > > >=3D20
> > > > It shouldn't do.
> > > >=3D20
> > > > What scheduler are you using?
> > >=3D20
> > > kern.sched.name: 4BSD
> > > kern.sched.quantum: 100000
> > > kern.sched.preemption: 1
> >=20
> > OK, that's correct.  Can you also provide details of your disk
> > hardware (e.g. dmesg) and kernel configuration?
>=20
> FreeBSD 6.0
>=20
> Kernel is stock except for addition of:
>=20
> 	device                atapicam        # needed to burn dvd
>=20
> /boot/loader.conf:
>=20
> 	console=3D"comconsole"
> 	hw.ata.wc=3D0
        ^^^^^^^^^^^
"Make my hard drive go reeeeally slow please (just in case I crash)" :)

Kris

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