Alexander Motin wrote: > Alexander Motin wrote: >> Threaded I/O activity could get much benefit from NCQ-aware disk driver. >> It is not included in default FreeBSD kernel, but it would be nice to >> compare. > > To check possible NCQ effect, I've built test setup with new 320GB > 7200RPM Seagate drive connected to Intel ICH10R controller. I've run > IMHO more reasonable benchmark/raidtest tool from ports on whole device, > to execute pregenerated random mix of 10000 random-sized (512B - 128KB) > read/write requests using default ata(4) driver and new ahci(4): > Number of READ requests: 5029. > Number of WRITE requests: 4971. > Number of bytes to transmit: 655986688. > Number of processes: 32. > > The results: > ata(4) - no NCQ: > Bytes per second: 12455402 > Requests per second: 189 > ahci(4) - with NCQ: > Bytes per second: 19889778 > Requests per second: 303 > > Results are repeatable up to the 4-th digit. Average time per request is > 5.29ms and 3.3ms respectively, that seems realistic for this drive. If you have a drive to play with, could you also check UFS vs ZFS on both ATA & AHCI? To try and see if the IO scheduling of ZFS plays nicely. For benchmarks I suggest blogbench and bonnie++ (in ports) and if you want to bother, randomio, http://arctic.org/~dean/randomio .Received on Tue Dec 01 2009 - 14:30:50 UTC
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