linux-kernel - Re: Understanding lspci output

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Message-id: <47169C9F.9040809@shaw.ca>
Date:	Wed, 17 Oct 2007 17:37:03 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	John Sigler <linux.kernel@...e.fr>
Cc:	Martin Mares <mj@....cz>, linux-kernel@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz
Subject: Re: Understanding lspci output

John Sigler wrote:
>>> 4. Does the system have a PCI-X bus?
>>
>> Yes, the devices on bus 01 are PCI-X devices, so there is a PCI-X bus.
> 
> I thought PCI-X devices could operate on a PCI bus? If that is true, 
> then the presence of a PCI-X device would not necessarily imply the 
> presence of a PCI-X bus, right?
> 
> There are no external PCI-X slots in the system, only 2 PCI slots.
> The 4 NICs are integrated to the motherboard.
> http://advantech.com/products/1U-Rackmount-Intel-Pentium-4Processor-based-Platform-with-4PCI-LAN-Ports-2-PCI-Expansion-Slots/mod_1-23A2W4.aspx 

The NICs are all PCI-X devices and they report "64bit+" so they will be 
running on a PCI-X bus internally.

> 
> 
>>> 2. Do any of the PCI buses support 66 MHz operation?
>>
>> Yes, PCI-X does.
> 
> So the 01:0f.0 device (Multimedia video controller) is on the same bus 
> as the 4 PCI-X devices and will have to share the bus bandwidth?
> 
> Does 66MHz+ in the Status line means this device is running at 66 MHz?

I believe so.

> 
>>> 3. Do any of the PCI slots support 64-bit data path?
>>
>> This cannot be inferred from the lspci output -- there is no way how to
>> tell if a bus has physical slots or it exists only internally.
> 
> Can I use lspci to see whether a specific PCI device is using a 64-bit 
> data path? (e.g. the 01:0f.0 device)

The "Multimedia video controller: DekTec Digital Video B.V. DTA-105" 
doesn't report PCI-X capabilities. And looking at the card on their web 
site, it does not have a 64-bit extension, so it doesn't support 64-bit.

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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