Re: [RFC] - Some notions that I would like comments on
Chuck Lever (cel@monkey.org)
Thu, 15 Jul 1999 21:41:24 -0400 (EDT)
> 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
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