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From: Robert Watson <rwatson@FreeBSD.org>
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To: ISP Informatique <mlh@ispinfo.fr>
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cc: freebsd-performance@freebsd.org
Subject: Re: FreeBSD 5.3 et multiprocessor
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On Wed, 9 Mar 2005, ISP Informatique wrote:

> Hello, I recently have just passed a server of FreeBSD 4.2 to FreeBSD
> 5.3. The nasty surprise being which I note a notable reduction in the
> performances. The machine is a HP LT6000r, quadri Xeon 700 with 2Go of
> RAM.
>=20
> The results are appreciably the same ones with a kernel including or not
> "options SMP".

Could you tell us a bit more about what kind of performance difference
you're seeing?  Specifically, what sort of workload?  There are a lot of
changes between 4.x and 5.x -- SMP model changes, threading changes, file
system changes, device driver changes, etc.  Trying to figure out what's
going on will require narrowing down a bit what the variables are.

Thanks,

Robert N M Watson


>=20
> Did I miss some thing?  or perhaps did this already arrive at others?=20
> In particular, I has just crossed this in
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-co=
nfig.html=20
>=20
>=20
> >
> > options          SCHED_4BSD         # 4BSD scheduler
> > =20
> >
> > The traditional scheduler for FreeBSD. Depending on your system's=20
> > workload, you may gain performance by using the new ULE scheduler for=
=20
> > FreeBSD that has been designed specially for SMP, but works just fine=
=20
> > on UP systems too. If you wish to try it out, replace SCHED_4BSD with=
=20
> > SCHED_ULE in your configuration file.
>=20
> Did you already test?=20
>=20
> By advance, thank you,
>=20
> --=20
> Hubert Adgi=E9
>=20
> ISP Informatique
> www.ispinfo.fr
> 0890 710 147
>=20
>=20
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> To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd=
=2Eorg"
>=20