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Deathly slow linux/5740 card

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nick
EVDO Newbie

Joined: 21 Mar 2006
Posts: 8

Posted: Thu Mar 30, 2006 7:21 pm Post subject: Deathly slow linux/5740 card

Hi, everyone
I've posted before, here, but need to rephrase. I'm running a 5740 card under Ubuntu Breezy (5.10) with kernel 2.6.10, and I patched according to the instructions Ken Kinder's great website.

I also changed the TCP window defaults:

Code:

in /etc/sysctl.conf

net/core/rmem_max = 8738000
net/core/wmem_max = 6553600

net/ipv4/tcp_rmem = 8192 873800 8738000
net/ipv4/tcp_wmem = 4096 655360 6553600

I can connect but according to two commercial testing sites, CNET's Broadband testing and DSL tester, I am running at about 110kbps under Linux while running at 300 kbps under WinXP. I am not using a firewall or proxy server and tested with FF1.5.

tz1 suggested reading the document at

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

which went right over my head but may contain the answer. Can anyone please offer any guidance about the folling statement tz1 made:

Quote:

There can also be an MTU/MRU mismatch slowing things, as well as your system as a whole...

This as well, tantalized but I can't understand - can anyone offer help to tell me HOW I can effect these changes suggested by that IBM document?

Quote:

The Sockets API provides several socket options, two of which exist to change the socket send and receive buffer sizes. Listing 2 shows how to adjust the size of the socket send and receive buffers with the SO_SNDBUF and SO_RCVBUF options.

Code:

Manually setting the send and receive socket buffer sizes

int ret, sock, sock_buf_size;

sock = socket( AF_INET, SOCK_STREAM, 0 );

sock_buf_size = BDP;

ret = setsockopt( sock, SOL_SOCKET, SO_SNDBUF,
(char *)&sock_buf_size, sizeof(sock_buf_size) );

ret = setsockopt( sock, SOL_SOCKET, SO_RCVBUF,
(char *)&sock_buf_size, sizeof(sock_buf_size) );

FYI, 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? I've been struggling with this for about a week.

Thanks in advance,
nick

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