Slow, stop start internet

Hi,

I have just installed yoper 2.1 on my pc, and the internet is for some reason going really slow - Transfer speeds are no more than about 50KBs, when i should be getting about 110KBs.

From looking a the transfers, it would appear that it seems to be downloading files in "bursts" of about 50kb at a time, then pausing, then downloading another 50kb, then pausing etc. When it is actually downloading, it is going at a perfectly good speed, but the pauses kill it, resulting in an overall low transfer speed.

I was reading that IPv6 can cause problems, but i looked in my kernel modules folder, and it would appear that IPv6 isnt installed.

Any ideas what could be casuing this slow net?

Thanks
Chrisp455Asked:
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pablouruguayCommented:
if you have ipv6 you only check ur ifconfig example

eth0      Link encap:Ethernet  HWaddr 00:02:55:B7:BF:01
          inet addr:200.40.23.66  Bcast:200.40.228.79  Mask:255.255.255.240
          inet6 addr: 2002:13ff:ffff::1/64 Scope:Global
          inet6 addr: fe80::202:55ff:feb7:bf01/64 Scope:Link

but i dont think that is the problem.

tcpdump ?

iptraf ?

have any iptables rule ?
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Chrisp455Author Commented:
Hi, thanks for the reply... i obviously dont have IPv6 in that case, as it isnt showing up

sorry , but i dont know what tcpdump or iptraf are =S if i type them into console, they are unrecognised =(

Yoper comes with Guard Dog to comfigure iptables, but i have it disabled, just in case

Thanks
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pablouruguayCommented:
ok.

tcpdump is a traffic analizer is good to view this problems because sniff all traffic in your nic. and iptraf is a bandwith analizer you can download this packages and see what happends in your network.

other check if you have the tool  

mii-tool

this command check your network card and tell you if are full duplex or have flow control and anything like this

[root@omega root]# mii-tool
eth0: negotiated 100baseTx-FD flow-control, link ok
eth1: negotiated 100baseTx-FD flow-control, link ok
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Chrisp455Author Commented:
Well, just used my head and did a search for iptraf - now have that installed

Its showing a fairly constant, but not very high rate (88KBs to be precice) while it is running at that rate however, other stuff runs really slow, as if all the bandwidth is being taken up ,even though there is at least 20, probably 30KBs left in the connection - it does however sometimes stall, which kills the rate, but does not inprove the speed of other applications.
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Chrisp455Author Commented:
Having problems finding a download of mii-tool (its not installed), but i dont think that the network is the problem ,as i can transfer files using samba very quickly across the network

Trying to find a download of tcpdump and mii-tool now
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pablouruguayCommented:
if you transfer quickly in samba the NIC is not the problem,

maybe resources of your server??

with the command free you can see your memory state please check if is good or if you have at least 50mb free after that check if your disk have space with df

 
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Chrisp455Author Commented:
Just done "df" and that reported, as expected the disk is pretty empty - 24% used

free however, i am not sure if i believe! I have a gig of ram, and it is telling me 936meg is being used, and only 90mb free - what on earth could be taking up so much memory? even windows doesnt eat that much!
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pablouruguayCommented:
jajajaj you are running something worng in your box

make a ps -ef and check what service are you running

after that use the command

top

to see which service eating your memory
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Chrisp455Author Commented:
Unfortunately i am not going to be able to get back to my pc until monday now :(, but i will try that when i get  back - just about to install yoper on another pc here, which is almost exactly the same spec, so i will see if it does it again.

Thanks
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Chrisp455Author Commented:
This computer has started doing it as well - it is reporting that there is only 100Mb of memory free. However, top is reporting that the program using the most memory is X, but that is only using 2% of the memory.

ps -ef shows that all the standard kde processes, logging processes are running, along with kopete (IM client) nspluginviewer (netscape?) korgac (the calendar thing i think)

And thats about it.
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pablouruguayCommented:
yep all is normal.  is rare.
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Chrisp455Author Commented:
Hmmm - just looked at KDE system guard - it is showing a huge ammount of cached stuff in the memory - could it be that for some reason stuff that is getting cached is not being cleared? The ammount of memory applications are taking up seems normal - about 200mb
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paranoidcookieCommented:
Generally X will use up pretty much all available memory and hold open programs in cache until memeory is needed for other apps.
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Chrisp455Author Commented:
ah ok .... so then memory is probably not the cause of the internet slow down?
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pablouruguayCommented:
check with the command

free

if you have memory available
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paranoidcookieCommented:
When you quote your expected speeds have you actually achieved these? I mean if you are on a shared broadband system like cable or dsl its quite possible the other people on your local loop are lowering your effective bandwidth.
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