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Linux QA: 102

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1
What is the difference between group and cgroup

group apply filesystem permissions to different users, while cgroup lets you limit or reserve resources

1
Explain SIGUSR1 signal

It is user defined signal #1

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Does GPT has extended or logical partitions

No

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grep -ril foo bar - What do flags ril mean?

r=recursive i=case insensitive l=print

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Explain the difference between Emulated NIC and Paravirtualized NIC

Emulated NIC simulates the behavior of specific hardware for which guests will already have a builtin driver. Paravirtualized NIC copies data into a buffer and alerts the guest or host, which it then copies out.

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Does SR-IOV improves network throughput?

Yes. SR-IOV reduces the amount of copying through buffers by using part of PCIe specification to let the guest OS talk directly to the physical NIC.

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What is AES-NI

AES-NI is hardware implementation of AES found in high end Intel CPUs.

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How to verify the allocated memory on virtual machine

If your Linux distribution has dmidecode, one way to verify the allocated memory - dmidecode -t memory | grep ‘Size:’

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