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SubjectRe: zero-copy TCP
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> > those pages out of cache which isnt so ideal if the CPU wants
> > them. Some of the results are suprisingly counter-intuitive like this
>
> Does it flush the CPU cache? I thought the CPU just snooped the bus and
> updated its cache with new data.

In general no.

> struct page of course). Note that it doesn't matter if another thread,
> and this includes truncate/write in another thread, clobbers the page
> data. That's just the normal effect of two concurrent writers to the
> same memory.

Oh it does matter. You might send out a page of kernel data by mistake, or
one some machines take a fault


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