linux-kernel - Re: Q: PCI-X @ 266MHz on HP rx6600 (Qlogic 4Gb FC HBA)

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Message-ID: <46B040BB.8979.A674628@Ulrich.Windl.rkdvmks1.ngate.uni-regensburg.de>
Date:	Wed, 01 Aug 2007 08:13:48 +0200
From:	"Ulrich Windl" <ulrich.windl@...uni-regensburg.de>
To:	Andrew Vasquez <andrew.vasquez@...gic.com>
CC:	Ulrich Windl <ulrich.windl@...uni-regensburg.de>,
	linux-kernel@...r.kernel.org
Subject: Re: Q: PCI-X @ 266MHz on HP rx6600 (Qlogic 4Gb FC HBA)

On 31 Jul 2007 at 9:50, Andrew Vasquez wrote:

> > On Fri, 27 Jul 2007, Andrew Patterson wrote:
> > 
> > > On Thu, 2007-07-26 at 23:23 -0700, Andrew Vasquez wrote:
> > >
> > > > The 33/66/100/133 values refer to the bus-clock speed at which the
> > > > card is operating.  As is seen here (although a bit truncated --
> > > > separate issue, I'll try to see if I can reproduce this on one of my
> > > > HPQ rigs), the card is inserted into a PCI-X Mode-2 capable 133MHz
> > > > (bus clock) slot.  When operating under this mode, each data-phase
> > > > between two devices is divided into 2 sub-phases, effectively doubling
> > > > the transfer-data-rate to 266Mhz.
> > > 
> > > I guess the proper terminology would be 266 MT/s (Mega
> > > Transfers/second). Looking through the PSI_SIG PCI-X 2.0 marketing
> > > blurbs, they use MHz a lot when referring to MT/S. So I would still
> > > consider this to be a minor bug.  The user wants to know the transfer
> > > rate, not the actual frequency of the bus.  Maybe just print out the
> > > mode used instead, e.g., "PCI-X 266"?
> 
> Given PCI-X Mode-2 can run at different bus-clock speeds, how about
> this as an alternative?
> 
> 	PCI-X 266 (133Mhz)

To pick up the idea, why not "133" and "133x2" (DDR, Dual Data Rate)?

> 
> it's a bit more descriptive than
> 
> 	PCI-X Mode 2 (133Mhz)
> 
> then again, I don't want to beat this thing to death...
> 
> ---
> 
> diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
> index c488996..26f7e54 100644
> --- a/drivers/scsi/qla2xxx/qla_os.c
> +++ b/drivers/scsi/qla2xxx/qla_os.c
> @@ -283,9 +283,9 @@ qla24xx_pci_info_str(struct scsi_qla_host *ha, char *str)
>  	} else {
>  		strcat(str, "-X ");
>  		if (pci_bus & BIT_2)
> -			strcat(str, "Mode 2");
> +			strcat(str, "266");
>  		else
> -			strcat(str, "Mode 1");
> +			strcat(str, "133");
>  		strcat(str, " (");
>  		strcat(str, pci_bus_modes[pci_bus & ~BIT_2]);
>  	}


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