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NFS server and reuse it for writes as well to allow writes to the backing store to be clustered. - Use a prime number for the size of the heuristic table (1017 is not prime). - Move the logic to locate a heuristic entry from the table and compute the sequential count out of VOP_READ() and into a separate routine. - Use the logic from sequential_heuristic() in vfs_vnops.c to update the seqcount when a sequential access is performed rather than just increasing seqcount by 1. This lets the clustering count ramp up faster. - Allow for some reordering of RPCs and if it is detected leave the current seqcount as-is rather than dropping back to a seqcount of 1. Also, when out of order access is encountered, cut seqcount in half rather than dropping it all the way back to 1 to further aid with reordering. - Fix the new NFS server to properly update the next offset after a successful VOP_READ() so that the readahead actually works. Some of these changes came from an earlier patch by Bjorn Gronwall that was forwarded to me by bde@. Discussed with: bde, rmacklem, fs@ Submitted by: Bjorn Gronwall (1, 4) MFC after: 2 weeks
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