fandino <fandino_at_ng.fadesa.es> writes: > yes, I run dd, bonnie++, bonnie and reports are very clear, there is > a problem with performance and the ata system (I think). There is no problem with the ATA subsystem in general. I have no trouble getting 40 MBps with raw sequential reads on my laptop and 50 MBps on my desktop (both running -CURRENT with INVARIANTS but no WITNESS, and both with fairly old disks). Unfortunately, my AMD64 box is not online right now or I could give you the numbers for its brand- new SATA150 drive under 5.3 BETA7. There may be problems with your particular hardware and / or software configuration, but you're not likely to get those solved by being so confrontational. As regards block sizes: there *is* a definite increase in performance - almost a full order of magnitude - going from 512 B to 64 kB. For larger block sizes, you will get a smaller improvement simply from amortizing the syscall overhead over larger transfers. I have no idea how Emmanuel Strobl managed to test performance with block sizes of 128 B and 256 B since the transfer size for an ATA disk needs to be a multiple of 512 B. DES -- Dag-Erling Smørgrav - des_at_des.noReceived on Fri Oct 22 2004 - 11:29:51 UTC
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