Re: Swap

David S. Miller (davem@redhat.com)
Tue, 20 Nov 2001 15:01:54 -0800 (PST)

From: Andrew Morton <akpm@zip.com.au>
Date: Tue, 20 Nov 2001 14:23:38 -0800

Could you please explain further? What's more expensive
than the copy?

TLB misses add to the cost, and this overhead is more than
"noise".

The Apache guys were playing with using mmap() for page contents
and it was always slower than read() into a static buffer.
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