linux-kernel - Re: Inter-process send()/recv() using zero-copy ?

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Message-Id: <200909231051.31818@zigzag.lvk.cs.msu.su>
Date:	Wed, 23 Sep 2009 10:51:31 +0400
From:	"Nikita V. Youshchenko" <yoush@...msu.su>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Inter-process send()/recv() using zero-copy ?

> the problem you have is that
> 1) memory copies are cheap
>    (say, 3000 cycles/page or less)

What about L1 cache pollution? Doesn't it change situation?

> 2) page table operations (mmap etc) are very expensive.
>
> these two combined tend to not make it a win to substitute simple
> copies with complex pagetable tricks.

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