[chbot] How to disable hyperthreading

Wed May 22 08:07:15 BST 2019

Are you running a multiple instances on this box? Do other people have access to those instances?

> On 21/05/2019, at 8:29 PM, Chris Hellyar <chris at trash.co.nz> wrote:
> 
> Urro,
> 
> Unless you're running a multi-tenant hypervisor or server facing the 'net without a 2nd gen firewall in front these side channel attacks are extremely unlikely to be an issue.  If you spent the money on a hyperthreading CPU chucking away 40% of your performance due to a vulnerability with no current demonstrated exploit you might also be interested in some tinfoil hats, and the left-handed long waits they sell at Blackwells.  :-)
> 
> 
> 
> On 21/05/19 20:01, Bevin Brett wrote:
>> You have to do it before the operating system is running,
>> so you turn the machine off, and during the startup hold down a manufacturer-specific key
>> to get into the bios menus
>> 
>> Here is an old but good article..
>> 
>> https://www.pcmag.com/article/314585/how-to-disable-hyperthreading 
>> 
>> Don't forget to do the os and bios upgrades as well - just disabling hyperthreading is only part of the fix - and not one that is needed on AMD chips, I believe.
>> 
>> /Bevin
>> 
>> 
>> From: Chchrobotics <chchrobotics-bounces at lists.ourshack.com> on behalf of chchrobotics-request at lists.ourshack.com <chchrobotics-request at lists.ourshack.com>
>> Sent: Monday, May 20, 2019 7:00 AM
>> To: chchrobotics at lists.ourshack.com
>> Subject: Chchrobotics Digest, Vol 140, Issue 7
>>  
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>> Today's Topics:
>> 
>>    1. Robotics Group meeting, Monday 20 May 2019, 630pm, 5 Idris
>>       Road (Mark Atherton)
>> 
>> 
>> ----------------------------------------------------------------------
>> 
>> Message: 1
>> Date: Mon, 20 May 2019 21:42:28 +1200
>> From: Mark Atherton <markaren1 at xtra.co.nz>
>> To: Christchurch Robotics <chchrobotics at lists.linuxnut.co.nz>
>> Subject: [chbot] Robotics Group meeting, Monday 20 May 2019, 630pm, 5
>>         Idris Road
>> Message-ID: <5c222566-c2ac-961d-8f8c-fa5700328510 at xtra.co.nz>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>> 
>> Hello everyone,
>> 
>> Quite a few new faces this evening; welcome.
>> 
>> Enthusiastic turnout with 23 attendees, and lots of huddles-of 
>> tech-talk. $43 + change (in gold, and flat-money) collected and 
>> transferred into the robotics loose-change jar (for later banking).
>> 
>> Quick reminder: equipment donations are welcome for the trading table, 
>> but no CRT based product, printers, toner or items that are likely to be 
>> a disposal burden. All sales from the trading table should go into the 
>> brown box on the wall, and are directly for the benefit of our host 
>> club, NZART Branch 05.
>> 
>> With thanks on behalf of the group,
>> 
>> Mark Atherton
>> 
>> PS thank you Trevor for locking up.
>> 
>> ============
>> 
>> William brought in a 3D optical waveguide seven-segment display, based 
>> entirely on cardboard, LED strips, and hot glue. Quite a clever piece of 
>> lateral thinking, and fabrication.
>> 
>> Peter brought in his 300V, 3kW modular power supply system (following on 
>> from the email reflector discussion).
>> 
>> Kerry brought in some ancient-semiconductors, including a 1954 germanium 
>> device, and one of the first samples of a silicon RF power device.
>> 
>> Bevin started off with quite a stunning description of the latest Intel 
>> cache-bug. He also brought along some more items from his mechanical 
>> calculator collection. This month, we were treated to some insight about 
>> the workings of a 1928 vintage Monroe calculator, as well as a tiny 
>> Curta hand-held 1957 rotary calculator.
>> 
>> David B talked about his latest purchase – a low cost laser cutter. He 
>> discussed some of the pitfalls, fixes and upgrades to make the machine a 
>> little more respectable.
>> 
>> Robin G talked about the latest generation, V low cost component tester 
>> product.
>> 
>> Volker talked about his latest investigation into Very Low Cost 
>> Chinese-sourced LED lighting, and associated power supplies. He also 
>> gave us an update on his coffee-maker project.
>> 
>> 
>> 
>> 
>> 
>> 
>> ------------------------------
>> 
>> Subject: Digest Footer
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>> ------------------------------
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>> End of Chchrobotics Digest, Vol 140, Issue 7
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