Date: Mon, 04 Jun 2007 10:18:40 -0400 From: Rob <r17fbsd@xxiii.com> To: FreeBSD Questions <freebsd-questions@freebsd.org> Cc: tundra@tundraware.com Subject: Re: Strange Intel Mobo Behavior Message-ID: <46641F40.8030508@xxiii.com> In-Reply-To: <4663AFCC.6080508@tundraware.com> References: <46630382.8010901@tundraware.com> <6.2.3.4.2.20070603232531.03dffe40@mailsvr.xxiii.com> <4663AFCC.6080508@tundraware.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Tim Daneliuk wrote: >> The ad6 drive is supposed to do SATA-300, but realistically, other >> bottlenecks dictate it's not going to get anywhere near the '150 speed, > > Could you comment a bit more on why you think this is so. I would > think that with modern processors and buses, a machine with light load > ought to be able to drive SATA-300, but I've never actuall tested for I was off on my initial assumptions. I thought the "150" was 150 Giga-bit/sec, or approx 15 Giga-byte, or 15000 MB/sec. Which is well above the PCI and other bus speeds it needs to travel through to get to the processor. But reading http://en.wikipedia.org/wiki/Serial_ATA it's 150 Mega-byte/sec. I think older ATA chipsets are part of the PCI bus, which at 32 bits * 33MHz, which is about a 132MB/sec bottleneck. I don't know enough about PCI-X, PCI-E and newer chipsets to know speeds & bottlenecks, so I'll just shut up now ;) But seems like > 100MBs should be within reach. -RW
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?46641F40.8030508>