cjp@beartrk.beartrack.com (CJ Pilzer) (07/14/90)
I have an Adaptec ACB-2322D ESDI disk controller with a Maxtor XT4380E drive. When running the PC Mag benchmark 5.1 software, the results show that there is an improvement in every disk performance test with the controller read ahead cache enabled except the DOS DISK ACCESS test. This test simply uses DOS interrupts to create, read and write disk files of various record lengths. With this test, the results are about 14 secs with the cache disabled and 47.18 secs with the onboard read ahead cache enabled. This is slower than the PC AT MFM drive which does 42.68secs. Can any one explain this result and what it means in the overall computer performance? BTW the other tests in the test suite of disk performance are: File create sequential write sequential read random write random read of groups of records as follows: 520 records/512 bytes each 64 records/4096 bytes each 16 records/16384 bytes each 8 records/32768 bytes each In all these tests the disk performance was better in each part with the cache enabled. This is a puzzlement to me. -- cj