Tom's Hardware > Forum > General Networking > Network General Discussions > Network speed issues
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burrybp   04-01-2003 at 05:51:43 AM

Hello all,
I'm having a weird problem with my home network (ie a desktop and laptop hooked up via a cross-over cable). When I transfer files from the desktop to the laptop the speeds are quite nice (4.5 MB/sec), however when I try to send files from the laptop to the desktop the transfers are increadibly slow (12 KB/sec). I've tried fiddling with settings, updating the drivers I can't seem to improve the speed. I'm baffled why the up and down speeds would be different. I've also noticed the thread about a similar issue, however, my problem is a bit more significant (4.5MB/s to 12KB/sec vs 30% to 60% traffic) and the only real "solution" was to reinstall XP. I doubt that I need to reinstall XP since the laptop hasn't had much use (maybe 30 hours total) and a very small amount of that time has been spent on a network.

Here is the system information:
Desktop:
celeron 1.7ghz
256 mb
aopen ax45-v with onboard lan Realtek rtl8136/810x
lucent winmodem
sb live!
Geforce 3 (original not TI)
2 hds, 1 cdrw, 1 cd
Win 98 se

Laptop:
this is a standard Toshiba sattelite 1115-s103
win xp home sp1
the Nic is also a realtek rtl8139/810x

any help would be greatly appreciated.

Thanks
Brent

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GhostKat   04-02-2003 at 05:09:18 AM
- 0 +

there is an interesting issue with TCP/IP settings between old versions of windows and newer versions. Certain settings like the TCP/IP receive window on 98SE or lower defaulted to something like 8kb for ethernet connections so does NT 4. Windows 2000 and XP got bumped up in thier default settings to 17kb. The following link is microsoft's article on trying to save files accross the network using dos to a windows 2000 computer. While it's not exactly the same case you have, it is a place to start in that if the 98 computer can only receive 8kb per packet it means more packets have to be transmitted to get the same amount of data then on a computer with a higher receive window, such as 2000 and XP.

<A HREF="http://support.microsoft.com/default.aspx?scid=KB;en-us;q244826" target="_new">Slow Performance When Copying File from MS-DOS Client to Windows 2000-Based Computer</A>

Changing the TCP settings can help with all kinds of speeds including download speeds from the net.

<A HREF="http://www.speedguide.net/downloads.php" target="_new">Speedguide.net downloads (get the tcp optimizer)</A>

hope this helps and enjoy

GK

Yes, I made it past newbie w00t.

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burrybp   04-02-2003 at 08:02:54 PM
- 0 +

Wow, Thanks for the post, I'd begun to think no one cared.

Anyway, I came to the same conclusion this morning and just got on to tell everyone the solution to my problem. How's that for a coincidence? I had adjusted the default receive window and mtu for optimal dialup speeds, I'm stuck on a very old telephone line network and switch since I live in a *very* rural area. It hit me this morning that the changes might have affected all tcp protocols and not just the dialup adapter's. After changing the default receive window I am now getting 8.0 MB/s sustained! However, it eats up 100% cpu at that speed. Well since I don't typically do much while transfering I'll just live with it.

Thanks again for the help and the spot on diagnosis.

Brent

-*PS The change also seems to have improved my dialup speed by 75%!*-<P ID="edit"><FONT SIZE=-1><EM>Edited by burrybp on 04/02/03 01:08 PM.</EM></FONT></P>

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