Messages in this thread | | | Date | Thu, 15 Jul 1999 21:41:24 -0400 (EDT) | From | Chuck Lever <> | Subject | Re: [RFC] - Some notions that I would like comments on |
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> On Wed, 14 Jul 1999 21:56:38 +0200, Jamie Lokier > <lkd@tantalophile.demon.co.uk> said: > > > Does this completely avoid blocking then? > > > I mean, is "readaround" for block @ 128k-192k triggered by > > reading/paging within block @ 64k-128k, or is it triggered by the first > > read with 128k-192k? > > No, not yet: it's something which we'll probably do eventually. > However, on any vaguely modern hardware, the track buffers on the disk > itself will keep filling once you've submitted one IO. Accessing the > next cluster will take a latency hit on the CPU, but we still get the > full disk bandwidth overall.
why trigger a page-in for the next cluster? doubling the cluster size might give the same behavior.
- Chuck Lever -- corporate: <chuckl@netscape.com> personal: <chucklever@netscape.net> or <cel@monkey.org>
The Linux Scalability project: http://www.citi.umich.edu/projects/linux-scalability/
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