Date: Wed, 25 Apr 2007 14:04:21 +0100 From: Tom Evans <tevans.uk@googlemail.com> To: Artem Kuchin <matrix@itlegion.ru> Cc: freebsd-stable@freebsd.org Subject: Re: Top not showing 4 cpus on 2 xeons with HT Message-ID: <1177506261.5651.0.camel@zoot.mintel.co.uk> In-Reply-To: <026301c78738$460bdf50$0c00a8c0@Artem> References: <00e301c7872d$03e1db80$0c00a8c0@Artem> <462F3E60.7010109@thekeelecentre.com> <026301c78738$460bdf50$0c00a8c0@Artem>
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--=-dfjVg6TkePV8FCjA316B Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Wed, 2007-04-25 at 16:50 +0400, Artem Kuchin wrote: > Richard Tector wrote: > > Artem Kuchin wrote: > >> I am just wondering if it is normal. > >> I have two xeon processors with HT on each of them. > >> When loading kernel says that 4 cpu's are found, > >> but when i do top i can see only 0 or 2 in the C > >> column. never 1 or 3. Is it normal? > >>=20 > >> FreeBSD 6.2-STABLE (cvsed 1 day ago) > > If I remember correctly, HT is disabled by default for security > > reasons but there should be a sysctl to enable it. I believe there is > > also a paper by Colin Percival on the issue. >=20 >=20 > ahh, heck, i'll take my chances. I've read the paper and the attack > seem to me almost unreal. Also, everybody is in the jail on the server. > =20 > > Note that in a lot of common loads, the use of HT with the standard > > scheduler does not yield any real benefits. >=20 > Hmm. I just turned it on and already see that hosts are running generally > faster (it is a hosting server, 100+ site). No numbers though. It just > *SEEMS* faster. Anyway, it cannot make thing slower for sure, or > can it? >=20 > -- > Regards, > Artem >=20 >=20 >=20 > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" Yes, quite easily. --=-dfjVg6TkePV8FCjA316B Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQBGL1HQlcRvFfyds/cRAlwKAJ9VhSJuWi2qP5EniOD3vculo3gFHQCgwagy Zi7lnL66ppz4/01W49c6jdU= =8Nrl -----END PGP SIGNATURE----- --=-dfjVg6TkePV8FCjA316B--
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