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Re: [Question #254386]: Writing something else than 0 in memory ?

To: sysbench-developers@xxxxxxxxxxxxxxxxxxx
From: Alexey Kopytov <question254386@xxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 12 Sep 2014 13:41:52 -0000
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Question #254386 on sysbench changed:
https://answers.launchpad.net/sysbench/+question/254386

Alexey Kopytov proposed the following answer:
My understanding from that description is that KSM does not optimize
memory bandwidth (on the contrary, it can make memory access less
efficient), but it does optimize memory footprint by sharing pages
between VMs/processes.

That is, whenever a process writes to a page, a real write occurs,
regardless of its contents. However, a page merge can be performed
_after_ the write by some background scan in the kernel.

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