From: Mark Rustad <mrustad@gmail.com>
To: Alan <alan@lxorguk.ukuu.org.uk>
Cc: Linus Torvalds <torvalds@osdl.org>,
Arjan van de Ven <arjan@infradead.org>,
Ben Collins <ben.collins@ubuntu.com>, Pavel Machek <pavel@ucw.cz>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.
Date: Fri, 1 Dec 2006 11:13:27 -0600 [thread overview]
Message-ID: <D3A09DC0-99E4-4F0F-BFB6-33FD6B4C7766@gmail.com> (raw)
In-Reply-To: <20061201165638.7d5f1c4e@localhost.localdomain>
On Dec 1, 2006, at 10:56 AM, Alan wrote:
>> So I think people have blown those SSL timing attacks _way_ out of
>> proportion, just because it sounds technical and cool.
>>
>> Besides, most of the time you can disable HT in the BIOS, which is
>> better
>> anyway if you don't want it.
>
> Agreed - but the SSL thing is an irrelevance. The main reason for
> disabling HT (especially on a single core CPU) is because a lot of
> workloads run faster with HT *off*.
Yes. Another way to effectively turn it off is to set maxcpus to the
number of physical cpus in your system. So far I have not encountered
a system that that approach does not work on.
--
Mark Rustad, MRustad@mac.com
next prev parent reply other threads:[~2006-12-01 17:13 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-30 4:26 Ubuntu patch sync for 2.6.20 Ben Collins
2006-11-30 4:26 ` Ben Collins
2006-11-30 4:26 ` Ben Collins
2006-11-30 4:26 ` [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading Ben Collins
2006-11-30 11:06 ` Alan
2006-11-30 18:08 ` Siddha, Suresh B
2006-12-01 13:29 ` Pavel Machek
2006-12-01 13:41 ` Ben Collins
2006-12-01 14:32 ` Arjan van de Ven
2006-12-01 15:09 ` Ben Collins
2006-12-01 16:10 ` Arjan van de Ven
2006-12-01 16:14 ` Ben Collins
2006-12-01 16:20 ` Linus Torvalds
2006-12-01 16:56 ` Alan
2006-12-01 17:13 ` Mark Rustad [this message]
2006-11-30 4:26 ` [PATCH 2/4] [APIC] Allow disabling of UP APIC/IO-APIC by default, with command line option to turn it on Ben Collins
2006-12-01 8:39 ` Ingo Molnar
2006-12-01 20:56 ` Ben Collins
2006-12-02 8:56 ` Ingo Molnar
2006-11-30 4:26 ` [PATCH 3/4] [ATM] Add CPPFLAGS to byteorder.h check Ben Collins
2006-11-30 4:26 ` [PATCH 4/4] [HVCS] Select HVC_CONSOLE if HVCS is enabled Ben Collins
2006-11-30 12:32 ` Roman Zippel
2006-11-30 15:04 ` Ben Collins
2006-12-07 22:50 [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading Peter Cordes
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