In the last episode (Jul 21), Tim Daneliuk said: > I asked this question a while back, but needed to do more digging to make > sure I had latest sources etc. > > I have an Intel motherboard that shows this for a SATA controller: > > atapci1: <Intel ICH7 SATA300 controller> port > 0x20c8-0x20cf,0x20ec-0x20ef,0x20c0-0x20c7,0x20e8-0x20eb,0x20a0-0x20af mem > 0x90204000-0x902043ff irq 19 at device 31.2 on pci0 > > But the hard drive - a SATA 300 device - shows up like this: > > ad4: 238475MB <WDC WD2500JS-00NCB1 10.02E02> at ata2-master SATA150 > ^^^^^^^ > Using dd, I have confirmed that the drive is running nowhere near > SATA-III speeds, at least on reads: > > 968470075 bytes transferred in 7.132891 secs (135775249 bytes/sec)
What was your dd commandline? If you've got more than 1GB of RAM and tested by reading a file and not the raw device itself, you just tested FreeBSD buffer cache. According to http://www.wdc.com/en/products/productspecs.asp?driveid=135 , that drive's maximum sustained speed is only 93.5 MB/sec, so it doesn't really matter if your interface is running at SATA150 or SATA300 unless you plan on reading exclusively from its 8MB buffer :) -- Dan Nelson [EMAIL PROTECTED] _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
