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How to test network speeds |
Posted by: hatebred - 2004-01-13, 11:18 PM - Forum: Tips and Tricks
- No Replies
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TTCP - How to check network transfer speeds. .:H A T E B R E D:.
DESCRIPTION
Ttcp times the transmission and reception of data between
two systems using the UDP or TCP protocols. It differs
from common ``blast'' tests, which tend to measure the
remote inetd as much as the network performance, and which
usually do not allow measurements at the remote end of a
UDP transmission. - From the man page
Now you know what it does here is a few ways to use it on your network to test transfer speed.
First we will start ttcp in recive mode on machine 1 - 192.168.1.105
The way I run it is in recive mode, be verbose (give more info), and sink all data. Sinking the data doesent print the data sent from the host to the target, in this case the contents of the 1 meg file I am sending.
[root@laptop howto] ttcp -r -v -s
ttcp-r: buflen=8192, nbuf=2048, align=16384/0, port=5001 tcp
ttcp-r: socket
From this you can see that ttcp started in recive mode and has the following structure:
buflen=8192 Length of buffers in bytes
nbuf=2048 Number of source buffers transmitted
align=16384/0 This has 2 parts to it.
1. the 16384 represents align the start of buffers to this modulus
2. 0 align the start of buffers to this offset.
port=5001 This is the port ttcp is listening on and can not be blocked by a firewall.
tcp tcp is used. You may also use UDP but TCP is better for testing in my opinon because it uses the same protocol as a majority of the network.
Now we have our target running ttcp in recive mode. Next we need to send the 1 meg file to it from our host
The way I run the host
[root@desktop howto] ttcp -t 192.168.1.100 < 1mb.001
ttcp-t: buflen=8192, nbuf=2048, align=16384/0, port=5001 tcp -> 192.168.1.100
ttcp-t: 1048576 bytes in 2.66 real seconds = 384.41 KB/sec +++
ttcp-t: 128 I/O calls, msec/call = 21.31, calls/sec = 48.05
As you can see from the first line the connection was successful to 192.168.1.100
The second line states that 1038576 bytes (1 MB) was sent in 2.66 seconds @ 384.41 KB/sec
Line there refers to the system used to do this. 128 I/O calls @ 48.05 calls a second.
Now back to the reciving system,
[root@laptop howto] ttcp -r -s -v
ttcp-r: buflen=8192, nbuf=2048, align=16384/0, port=5001 tcp
ttcp-r: 1048576 bytes in 2.75 real seconds = 372.85 KB/sec +++
ttcp-r: 1048576 bytes in 1.42 CPU seconds = 721.13 KB/cpu sec
ttcp-r: 191 I/O calls, msec/call = 14.72, calls/sec = 69.55
ttcp-r: 0.0user 1.4sys 0:02real 51% 0i+0d 0maxrss 0+2pf 0+0csw
ttcp-r: buffer address 0x8050000
So here is a system breakdown while we are at it:
DESC DESKTOP LAPTOP
300Mhz 233Mhz
seconds: 2.66 2.75
KB/sec 384.41 372.85
I/O calls 128 191
calls sec. 48.05 69.55
You can also do this between internet computers.
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VGA(0) error when starting X |
Posted by: InaVirtualGhetto - 2004-01-13, 06:15 PM - Forum: Gentoo
- Replies (5)
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(EE) VGA(0): virtual height (0) is too small for the hardware (min 1)
How can I go about fixing this? It also said something like:
(EE) Screen(s) found, but none have a usable configuration
If I fix the VGA(0) will teh screens problem go away? I'm lost. Didnt see it in the configuration file... Any suggestions besides an attempt to drown myself?
-Jim
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some problems |
Posted by: inflames - 2004-01-13, 05:14 PM - Forum: General Chat
- Replies (2)
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hi, im having some really annoying problems with my computer.
first of all, blue screen of death messages, its like a pick and mix. new ones each time, lol.
the most common ones are, however;
driver_irql_less_or_not_equal
*.sys messages (varying from win32k.sys to tcpip.sys)
bad_pool_caller
there is probably many more, since i cant remember them all.
another problem, is that my computer sometimes makes a tractor noise, like the sound of a tractor starting up (hard to belive) lol
i have tried switching around my pci cards in my mb. i have only one free pci slot atm though. (the pci slot beside the agp slot is free)
my current system specs are:
2ghz athlon xp
asus a7x8x mboard
windows xp w/ sp1
1gb pc2700 ddr ram
120gb 7200 rpm and 250gb 7200 rpm drives
4x dvd+-rw
48x cdrw
billion pci isdn modem
technotrends skystar dvb-s video capture card
hauppage wintv nova-t dvb-t video capture card
creative soundlabs soundcard
i have had the problem with my computer restarting itself ever since i first built it up, just over 1 year ago. however the problem has gotten gradually worse up-until now.
so, if anyone has any suggestions on how i can sort out these problems it would be greatly appreciated =)
thanks
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alpha centauri for linux |
Posted by: tek-69 - 2004-01-13, 01:14 PM - Forum: General Chat
- No Replies
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went to loki website an the store closed down, and couldnt find a store online with A.C. anywhere, plus no distibutors in usa ? bah . anyone have a copy of this game? its one of my all time favorites and would love to have it on my linux box.
have fun
-tek-
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1000 posts and 77 users |
Posted by: anyweb - 2004-01-13, 01:05 PM - Forum: Site News
- No Replies
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Cool we now have 1000 posts and 77 users in one month of online action
keep up the good work everyone and lets get more action/users :)
cheers and thanks
anyweb
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god bless upgrades |
Posted by: tek-69 - 2004-01-13, 04:23 AM - Forum: General Chat
- Replies (6)
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After 6months of grueling poverty and laziness I finally got my ass up and
went to the store for more ram. it's amazing what an extra 128m of ram will do.
With 196total my box feels like the lean mean machine i always pretended it was :P
Once again i'm telling you guys inane information(see my mp3 post) because my girlfriend
just stares at me funny when i tell her an begin drooling myself.
have fun
-tek-
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Dave |
Posted by: Dave - 2004-01-12, 11:10 PM - Forum: Hello
- Replies (1)
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Hey, I'm Dave (aliased as Quirix). Still running XP, got my IDE drive on order so I hope to be running a linux distro soon...
Had Redhat 9 running when i had my old PC with IDE drives, but upgraded to SATA since then and i got confused and thought the console was very warped but when i install i look forward to learning linux :-)
Aspiring to be a Linux user, rather than a buggy sneaky lying Microsoft system user lol
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