I know that ESX(i) has a setting that allows you to take advantage of hyperthreading if it's enabled in the bios. I haven't done any tests to determine if it actually improves performance or not, but since there's a setting for it, I'm blindly guessing that it doesn't hurt (assuming you have the little box checked)
--Matt On Wed, Jul 21, 2010 at 2:01 PM, Doug Hughes <[email protected]> wrote: > Yves Dorfsman wrote: >> On 10-07-21 11:30 AM, Doug Hughes wrote: >> >>> Yves Dorfsman wrote: >>> >>>> I know that disabling hyper-threading in the BIOS improves performance >>>> for some type of applications. >>>> >>>> Has anybody looked into, or has experience the impact of disabling VT >>>> and VT-d on performance? >>>> >>>> >> >> >>> It depends greatly upon the application. Some multi-threaded >>> applications get boost from having it enabled as it helps with hardware >>> context switching. Single-threaded monolithic applications can benefit >>> by not having this on and having one per core. There are many other >>> factors including whether the application fits in cache that affect >>> performance too. >>> >> >> Are you talking about hyper-threading or VT / VT-d here? >> >> For hyper-threading, the software vendor is recommending to disable it, based >> on their own tests. >> >> (btw, in case it isn't obvious, I am talking about systems dedicated to one >> OS >> install only (the old fashion way), rather than VMs, or VM monitors). >> >> > I was talking about hyperthreading, but it also applies to a more > limited extent to virtualization technology. If you're not running or > planning on running virtualization, you may or may not get a performance > boost out of disabling it, and it's probably dependent on several factors. > > _______________________________________________ > Tech mailing list > [email protected] > http://lopsa.org/cgi-bin/mailman/listinfo/tech > This list provided by the League of Professional System Administrators > http://lopsa.org/ > -- LITTLE GIRL: But which cookie will you eat FIRST? COOKIE MONSTER: Me think you have misconception of cookie-eating process. _______________________________________________ Tech mailing list [email protected] http://lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
