Messages in this thread | | | Date | Fri, 16 Jul 1999 07:50:23 +0200 | From | Jamie Lokier <> | Subject | Re: [RFC] - Some notions that I would like comments on |
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Chuck Lever wrote: > > > 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.
I don't see how it will. Doubling the cluster size just halves the number of times when we get the latency hit of a synchronous read of the first page in a cluster.
-- Jamie
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