ubuntu – Why should I enable IO APIC in VirtualBox? – Server Fault

Jovan Stosic May 18, 2019

Enable I/O APIC

Advanced Programmable Interrupt Controllers (APICs) are a newer x86 hardware feature that have replaced old-style Programmable Interrupt Controllers (PICs) in recent years. With an I/O APIC, operating systems can use more than 16 interrupt requests (IRQs) and therefore avoid IRQ sharing for improved reliability.

Note: Enabling the I/O APIC is required for 64-bit guest operating systems, especially Windows Vista; it is also required if you want to use more than one virtual CPU in a virtual machine.

However, software support for I/O APICs has been unreliable with some operating systems other than Windows. Also, the use of an I/O APIC slightly increases the overhead of virtualization and therefore slows down the guest OS a little.

Warning: All Windows operating systems starting with Windows 2000 install different kernels depending on whether an I/O APIC is available. As with ACPI, the I/O APIC therefore must not be turned off

Source: ubuntu – Why should I enable IO APIC in VirtualBox? – Server Fault

Anton Rubinstein

Jovan Stosic May 13, 2019

Anton Grigorevich Rubinstein (Russian: Антон Григорьевич Рубинштейн, tr. Anton Grigorevich Rubinshteyn; November 28 [O.S. November 16] 1829 – November 20 [O.S. November 8] 1894) was a Russian pianist, composer and conductor who became a pivotal figure in Russian culture when he founded the Saint Petersburg Conservatory. He was the elder brother of Nikolai Rubinstein who founded the Moscow Conservatory.

As a pianist, Rubinstein ranks among the great 19th-century keyboard virtuosos. He became most famous for his series of historical recitals—seven enormous, consecutive concerts covering the history of piano music. Rubinstein played this series throughout Russia and Eastern Europe and in the United States when he toured there.

Although best remembered as a pianist and educator (most notably in the latter as the composition teacher of Tchaikovsky), Rubinstein was also a prolific composer throughout much of his life. He wrote 20 operas, the best known of which is The Demon. He composed a large number of other works, including five piano concertos, six symphonies and a large number of solo piano works along with a substantial output of works for chamber ensemble.

https://en.wikipedia.org/wiki/Anton_Rubinstein