Date: Fri, 09 May 2008 18:32:57 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: DAve <dave.list@pixelhammer.com> Cc: 'User Questions' <freebsd-questions@freebsd.org> Subject: Re: FBSD 6.2 Xeon 2.4ghz CPU and high load Message-ID: <48248AC9.5060507@infracaninophile.co.uk> In-Reply-To: <482473B7.7070707@pixelhammer.com> References: <482473B7.7070707@pixelhammer.com>
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DAve wrote:
> Good morning.
>=20
> I recently upgraded our two email gateways from 4.8 to 6.2. The require=
d=20
> software was upgraded as well which consists of MailScanner and=20
> Sendmail. Both had been keep up to date so it was not a jump in require=
d=20
> resources.
>=20
> The issue I am seeing is that my server load, under the same traffic=20
> load, has increased 4 times or more. Where previously we saw a high loa=
d=20
> on the servers of 5 to 8, we are now seeing 14 to 17. Since the upgrade=
=20
> Sendmail has begun to timeout connections.
FreeBSD 6.2 is I believe slower than 4.11 for single processor systems
and processes which pretty much run single threaded -- ie. exactly what
you're trying to run. This would cause exactly the sort of symptoms you'=
re
seeing.
Try 7.0 instead -- it has all of the speed at multi-threaded, multi-core
type stuff but has also regained the sort of performance levels you could=
get from 4.x at the sort of tasks 4.x is really good at. You should eval=
uate
SCHED_4BSD vs. SCHED_ULE for your workload. SCHED_4BSD is still the defa=
ult
in 7.0, but SCHED_ULE gives better numbers for many workloads, and it onl=
y
missed being the default in 7.0 because it hadn't had enough time to sett=
le
into the tree before the release. SCHED_ULE will be the default from 7.1=
onwards.
Cheers,
Matthew
--=20
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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