Bits 'n Bytes.

This is basic Computer Science but its worth restating the basics sometimes.

bits

A bit is the smallest component in computer memory, it has two states, either ON or OFF. These states are represented as 1 or 0 and thus everything is based on binary arithmatic. 
Off == 0
On  == 1

Bytes

For convinence, bits are grouped into blocks of 8, these blocks are called Bytes. An integer byte can store any value from 0 -> 255. ------------------------- 128 64 32 16 8 4 2 1 ------------------------- 8 4 2 1 8 4 2 1 ------------------------- F F -------------------------

KiloBytes

This is a thousand bytes. The exact value is 2 to the power of 10 or 1,024

MegaBytes

This is a Million bytes. The exact value is 2 to the power of 20 or 1,048,576

GigaBytes

The exact value is 2 to the power of 30 or 1,073,741,824

TeraBytes

The exact value is 2 to the power of 40 or 1,099,511,627,776 (big....)

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Martin Leslie
960f94b2516b41296'>treecommitdiff
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authorMadhavan Srinivasan <maddy@linux.vnet.ibm.com>2016-12-19 17:46:53 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2017-01-18 16:03:34 +1100
commitdf21d2fa733035e4d414379960f94b2516b41296 (patch)
treec1e7e935e46071b4a134a814fae9fc8fec6324fb /net/ipv4/ip_output.c
parent387bbc974f6adf91aa635090f73434ed10edd915 (diff)
selftest/powerpc: Wrong PMC initialized in pmc56_overflow test
Test uses PMC2 to count the event. But PMC1 is being initialized. Patch to fix it. Fixes: 3752e453f6ba ('selftests/powerpc: Add tests of PMU EBBs') Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'net/ipv4/ip_output.c')