Date: Sun, 24 Jan 2010 23:53:43 +0200 From: Alexander Motin <mav@FreeBSD.org> To: Dan Naumov <dan.naumov@gmail.com> Cc: freebsd-fs@freebsd.org, Jason Edwards <sub.mesa@gmail.com>, FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org>, freebsd-questions@freebsd.org Subject: Re: 8.0-RELEASE/amd64 - full ZFS install - low read and write disk performance Message-ID: <4B5CC167.5010604@FreeBSD.org> In-Reply-To: <1264368182.00211075.1264355402@10.7.7.3> References: <883b2dc51001240905r4cfbf830i3b9b400969ac261b@mail.gmail.com> <1264368182.00211075.1264355402@10.7.7.3>
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Dan Naumov wrote: > This works out to 1GB in 36,2 seconds / 28,2mb/s in the first test and > 4GB in 143.8 seconds / 28,4mb/s and somewhat consistent with the > bonnie results. It also sadly seems to confirm the very slow speed :( > The disks are attached to a 4-port Sil3124 controller and again, my > Windows benchmarks showing 65mb/s+ were done on exact same machine, > with same disks attached to the same controller. Only difference was > that in Windows the disks weren't in a mirror configuration but were > tested individually. I do understand that a mirror setup offers > roughly the same write speed as individual disk, while the read speed > usually varies from "equal to individual disk speed" to "nearly the > throughput of both disks combined" depending on the implementation, > but there is no obvious reason I am seeing why my setup offers both > read and write speeds roughly 1/3 to 1/2 of what the individual disks > are capable of. Dmesg shows: > > atapci0: <SiI 3124 SATA300 controller> port 0x1000-0x100f mem > 0x90108000-0x9010807f,0x90100000-0x90107fff irq 21 at device 0.0 on > pci4 > ad8: 1907729MB <WDC WD20EADS-32R6B0 01.00A01> at ata4-master SATA300 > ad10: 1907729MB <WDC WD20EADS-00R6B0 01.00A01> at ata5-master SATA300 8.0-RELEASE, and especially 8-STABLE provide alternative, much more functional driver for this controller, named siis(4). If your SiI3124 card installed into proper bus (PCI-X or PCIe x4/x8), it can be really fast (up to 1GB/s was measured). -- Alexander Motin
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