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.
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