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Date: Thu, 18 Nov 2004 09:22:34 -0800
From: Aaron Glenn <aaron.glenn@gmail.com>
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cc: freebsd-performance@freebsd.org
Subject: Re: I've ran out of ideas
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d# dd if=3D/dev/ad2s1 of=3D/dev/null bs=3D64k count=3D1000
1000+0 records in
1000+0 records out
65536000 bytes transferred in 1.353203 secs (48430278 bytes/sec)
d#

iostat has never gone above 3.8MB/s

aaron.glenn

On Thu, 18 Nov 2004 02:55:43 -0800 (PST), Arne W=F6rner
<arne_woerner@yahoo.com> wrote:
>=20
>=20
> > > I'm pushing large files via thttpd over low-end
> > > hardware (celeron
> > > 1.8GHz, 512MB RAM, UATA 100 drive) and, out of the
> > > box, FreeBSD
> > > 5.3-RELEASE topped out at 40Mbps sustained. After
> > > creating a separate
> > > partition with a much larger blocksize, it's hit
> > > 50Mbps sustained but
> > > won't go past 54Mbps at all.
> >
> > You could try adding/tweaking HZ to 1000/2000 in
> > kernel and add kern.polling.enable=3D1 to
> > /etc/sysctl.conf.
> >
> Here I would like to mention the man page polling(4) for clarification (i=
t does
> not look like the GENERIC kernel can do polling...).
>=20
> Furthermore I would like to know, how fast is a "dd if=3D/dev/discXY of=
=3D/dev/null
> bs=3D64k count=3D1000" in single user mode on your box (I can do 42.8MByt=
e/sec with
> UDMA-100 and ST340015A (Seagate?))...
>=20
> -Arne
>=20
>=20
> __________________________________
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>=20
>