Patched 2.6.10 but still slow with 5740. Help?

nick · EVDO Newbie Joined: 21 Mar 2006 Posts: 8

Hi
After reading with interest the instructions at

http://kenkinder.com/evdo-pc5740/

and

http://www.evdoforums.com/viewtopic.php?p=6180#6180

I patched my kernel and reloaded and while I can still connect, I am running at about 110kbps under Linux while running at 300 kbps under WinXP.

I'm loading:

sudo modprobe ohci_hcd
sudo modprobe usbserial vendor=0x106c product=0x3701 maxSize=16384
sudo modprobe cdc_acm maxszr=16384 maxszw=2048

File: /etc/ppp/peers/1xevdo:

ttyACM0
#115200
9600
noauth
defaultroute
usepeerdns
connect "/usr/sbin/chat -v -f /etc/chatscripts/1xevdo"
user "xxxxxxxxxx@vzw3g.com"
show-password
lock
lcp-echo-failure 4
lcp-echo-interval 65535
connect '/usr/sbin/chat -v -t3 -f /etc/ppp/peers/1xevdo_chat'

File: /etc/ppp/peers/1xevdo_chat

ABORT 'NO CARRIER'
ABORT 'ERROR'
ABORT 'NO DIALTONE'
ABORT 'BUSY'
ABORT 'NO ANSWER'
'' ATZ
OK-AT-OK ATDT#777
TIMEOUT 45
CONNECT \d\c

Can anyone suggest any thing I can change?

Thanks in advance,
nick

tz1 · Posted: Tue Mar 28, 2006 7:08 am Post subject:

http://www-128.ibm.com/developerworks/linux/library/l-hisock.html

There can also be an MTU/MRU mismatch slowing things, as well as your system as a whole - which browser (if you use a text browser like lynx it might be faster), if you have firewalling or a proxy which has to examine the packets first...

And how are you determining speeds?

nick · EVDO Newbie Joined: 21 Mar 2006 Posts: 8

Thanks for the helpful reply!

> http://www-128.ibm.com/developerworks/linux/library/l-hisock.html

Thanks. Interesting and raises another question, below, but first let me answer the basic questions which I should have stated in the first post:

>There can also be an MTU/MRU mismatch slowing things
Sorry, I don';t know how I would tell if this were the case, can you help me a bit further?

>as well as your system as a whole - which browser (if you use a text browser like lynx it might be faster),

I tested using Firefox 1.5 and the method I used was utterly unscientific: first using FF1.5 under Windows XP and the same card then under Linux, neither using host based firewalls nor proxies. To determine speed I used two commercial testing sites, Cnet's Broadband testing http://reviews.cnet.com/7004-7254_7-0.html and BBR http://www.dslreports.com/stest?loc=1.

Now. In the document you sent it refers to the Sockets API and my ability to adhust the socket receive rate from the default linux setting of 110KB to the more appropriate 625KB which sure sounds right on to me. However the fix is beyond my understanding:

nick · EVDO Newbie Joined: 21 Mar 2006 Posts: 8

In researching further I see a couple of articles such as the one here and here saying basically the same thing: