linux-kernel - Re: Sierra Wireless (MC8780) HSDPA speed issue

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Message-ID: <alpine.DEB.1.10.0903142021580.5797@fujje.iml.umu.se>
Date:	Sat, 14 Mar 2009 20:34:40 +0100 (CET)
From:	Ralf Nyren <ralf@...en.net>
To:	Greg KH <greg@...ah.com>
cc:	linux-kernel@...r.kernel.org, klloyd@...rrawireless.com,
	rfiler@...rraWireless.com
Subject: Re: Sierra Wireless (MC8780) HSDPA speed issue

Hi,

I choose to only test download speeds for now but upload will also be of
interest later on.

I had actually tried to change the N_IN_URB/N_OUT_URB before sending of the
report but now I've been testing with both 8 and 128 but the speed remains the
same. Download speed max 1.0Mbit/s in Linux while the Windows driver could get
an average of 2.5Mbit/s at my current location (different location than during
the last test).

I have also tried the new 1.6.0 driver as kindly supplied by Sierra but the
speed remained the same 1.0Mbit/s with the new driver as well...

Anything else you think I could try?

Best regards, Ralf

On Fri, 13 Mar 2009, Greg KH wrote:

>
> Are you testing up or down speeds?
>
> If you want to, and you think the driver is the problem, try changing
> the values in drivers/usb/serial/sierra.c:
> 	/* per port private data */
> 	#define N_IN_URB        4
> 	#define N_OUT_URB       4
> 	#define IN_BUFLEN       4096
>
> Try bumping up the N_IN_URB and N_OUT_URB values a bunch and let me know
> if things go faster now.
>
> thanks,
>
> greg k-h
>
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