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With a high proportion of reads requests, a slightly smaller page size may be desirable. When used in conjunction with
the read-ahead feature, read performance may be optimized. For these two reasons the default page size value is 32 KB.
To improve read performance, read-ahead values of 1 to 3 will prove effective for many application.
Read ahead, in pages
Describes the number of additional, trailing cache pages that will be read from disk when a read request cannot be
serviced immediately from the cache. Applications with a high proportion of reads generally benefit from a read-ahead
setting of 1-3. Applications that perform large-size read requests, or frequent bursts of sequential reads, may benefit
from a larger read-ahead setting.
The maximum value of this setting varies according to page size. For page sizes of 4, 8, 16, 32, and 64 KB, the maximum
value is 15 pages. For page sizes of 128 and 256 KB, the maximum values are 7 and 3 pages, respectively. |
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