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Wednesday May 30, 2007

SATA NCQ vdbench results - issued concurrently v. singly These are the test results that were gathered in comparing I/O throughput with NCQ commands (FPDMA READ/WRITE) being issued one at a time and with NCQ commands being issued concurrently (up to 32 at a time).

NCQ commands issued one at a time:

params1 represents random reads, unrestricted
params2 represents random reads, restricted to first 4GB
params3 represents sequential reads
params4 represents random writes, unrestricted
params5 represents random writes, restricted to first 4GB
params6 represents sequential writes

NCQ commands issued concurrently:

params1 represents random reads, unrestricted
params2 represents random reads, restricted to first 4GB
params3 represents sequential reads
params4 represents random writs, unrestricted
params5 represents random writs, restricted to first 4GB
params6 represents sequential writes

( May 30 2007, 12:14:25 AM PDT ) Permalink