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Date:      Sun, 22 Jul 2007 00:10:12 -0300
From:      "Marc G. Fournier" <freebsd@hub.org>
To:        Dan Nelson <dnelson@allantgroup.com>, Tim Daneliuk <tundra@tundraware.com>, freebsd-stable@freebsd.org
Cc:        FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject:   Re: SATA 300 Drive Being Run At 150
Message-ID:  <1431AA268771E71884A824C3@fserv.hub.org>
In-Reply-To: <20070721165539.GA2579@dan.emsphone.com>
References:  <46A22253.8080100@tundraware.com> <20070721165539.GA2579@dan.emsphone.com>

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- --On Saturday, July 21, 2007 11:55:39 -0500 Dan Nelson 
<dnelson@allantgroup.com> wrote:

> 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 :)

'k, I just bought a new desktop, SATA/300MB/s interface, and this drive:

<http://www.wdc.com/en/products/products.asp?DriveID=254>;

Web site states 3Gb/s ... I'm seeing same SATA!50:

atapci0: <JMicron JMB361 SATA300 controller> port 
0xbf00-0xbf07,0xbe00-0xbe03,0xbd00-0xbd07,0xbc00-0xbc03,0xbb00-0xbb0f mem 
0xfdbfe000-0xfdbfffff irq 16 at device 0.0 on pci2
atapci1: <Intel ICH8 SATA300 controller> port 
0xfa00-0xfa07,0xf900-0xf903,0xf800-0xf807,0xf700-0xf703,0xf600-0xf60f,0xf500-0xf50f 
irq 19 at device 31.2 on pci0
atapci2: <Intel ICH8 SATA300 controller> port 
0xf300-0xf307,0xf200-0xf203,0xf100-0xf107,0xf000-0xf003,0xef00-0xef0f,0xee00-0xee0f 
irq 19 at device 31.5 on pci0
ad8: 152627MB <WDC WD1600AAJS-08PSA0 05.06H05> at ata4-master SATA150

Latest 6.x STABLE ...

- ----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email . scrappy@hub.org                              MSN . scrappy@hub.org
Yahoo . yscrappy               Skype: hub.org        ICQ . 7615664
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