On Tue, 01 Dec 2009 17:22:00 +0200 Alexander Motin <mav_at_FreeBSD.org> 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. Alexander, to make use of all this new stuff I need to run HEAD ? as former HEAD was born recently as 8.0R and the new stuff in it is big compared to 7.x, I'd like to use it from RELENG_8. is this possible ? my hardware would be NVIDIA nForce 680i SLI motherboard and Seagate ES.2 disks. thanks, matheus -- We will call you Cygnus, The God of balance you shall be A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? http://en.wikipedia.org/wiki/Posting_styleReceived on Tue Dec 01 2009 - 14:38:27 UTC
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