Peter Jeremy <jere...@gsmx07.alcatel.com.au> writes: > Dag-Erling Smorgrav <d...@flood.ping.uio.no> wrote: > > The idea is to keep a chunk of zeroes on disk and DMA it into memory > Have you looked at disk latencies recently? A modern CPU could zero- > fill a decent fraction of its RAM in the time taken to fetch a page of > zeroes from the platter. And if it was accessed frequently enough to > keep the zeroed page in disk cache, you've just moved the bottleneck > into that disk controller (and you've reduced the effective size of the > disk's cache by a page).
It still beats the hell out of invalidating your entire L1 and L2 caches. DES -- Dag-Erling Smorgrav - d...@flood.ping.uio.no To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
