linux-kernel - Re: GT/s vs Gbps for PCIe bus speed

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Message-ID: <m3ljjdstbb.fsf@intrepid.localdomain>
Date:	Wed, 14 Oct 2009 20:51:04 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Stefan Assmann <sassmann@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	kaneshige.kenji@...fujitsu.com, matthew@....cx, ddutile@...hat.com
Subject: Re: GT/s vs Gbps for PCIe bus speed

Stefan Assmann <sassmann@...hat.com> writes:

> IMHO this is rather confusing, as most people don't know what GT/s means.

It's trivial to look it up, isn't it?

> So I'd suggest the following change:
>
> --- a/drivers/pci/hotplug/pci_hotplug_core.c
> +++ b/drivers/pci/hotplug/pci_hotplug_core.c
> @@ -86,8 +86,8 @@ static char *pci_bus_speed_strings[] = {
>  	"66 MHz PCIX 533",	/* 0x11 */
>  	"100 MHz PCIX 533",	/* 0x12 */
>  	"133 MHz PCIX 533",	/* 0x13 */
> -	"2.5 GT/s PCI-E",	/* 0x14 */
> -	"5.0 GT/s PCI-E",	/* 0x15 */
> +	"2.5 Gbps PCI-E",	/* 0x14 */
> +	"5.0 Gbps PCI-E",	/* 0x15 */

Isn't it like calling 100BASE-TX a 125 Mb/s? _That_ would be confusing.
BTW PCI-E can be multi-lane so Mb/s (and even MB/s) don't make sense.
I guess many people don't know what a MHz is either but we don't say
133 MHz = 133 Mbps.
-- 
Krzysztof Halasa
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