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eamonn
Tux's lil' helper
Joined: 18 Mar 2003
Posts: 118
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 Posted: Fri Nov 25, 2005 4:18 pm Post subject: Slow network speeds |
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We have two switches. One on each floor. On one floor there is our gentoo (CVS) server and our redhat (Mail) server and 4 windows xp machines all connected using a gb switch. this switch is connected to our switch upstairs. Our switch upstairs it is a 100mb switch with our debian (DHCP/DNS/IPSEC) server with about 14 windows xp machines connected to it.
We have slow network speeds. Like 400k between machines. When we download from the internet (through a debian router/dhcp server) we get 800k (our isp max)
When we check stuff out of cvs it is really slow and much slower commiting in new work
any ideas? common pitfalls? |
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frostschutz
Advocate
Joined: 22 Feb 2005
Posts: 2977
Location: Germany
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| Posted: Fri Nov 25, 2005 4:50 pm Post subject: |
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| For slow transfer speeds, there can be so many reasons. Bad hardware, like cables/wall outlets that cause packet loss, switches that have problems with the load, cheap network cards. Bad setup, like connecting two switches with only one cable, restricting the total bandwidth between machines of the two groups to only 100mbit. Not to mention software configuration problems, like not using DMA, bad distribution of load among servers, ... |
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eamonn
Tux's lil' helper
Joined: 18 Mar 2003
Posts: 118
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| Posted: Sun Nov 27, 2005 9:49 pm Post subject: |
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| frostschutz wrote: | | Bad setup, like connecting two switches with only one cable, restricting the total bandwidth between machines of the two groups to only 100mbit. ... |
mhh so only using one cable will slow it down. how many should i use to connect the switches?
its weird because the speeds were nice but now they are bad. we have had no extra machines added or hardware changes to cause this slow down. |
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ph03n1x
l33t
Joined: 06 Feb 2003
Posts: 756
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| Posted: Sun Nov 27, 2005 10:25 pm Post subject: |
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| Well looks like a damaged switch or uplink cable. If you have decent switch you should not have performance problems at all with only 14 computers for office use. |
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frostschutz
Advocate
Joined: 22 Feb 2005
Posts: 2977
Location: Germany
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| Posted: Sun Nov 27, 2005 10:28 pm Post subject: |
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| eamonn wrote: | | frostschutz wrote: | | Bad setup, like connecting two switches with only one cable, restricting the total bandwidth between machines of the two groups to only 100mbit. ... |
mhh so only using one cable will slow it down. how many should i use to connect the switches? |
It won't necessarily slow it down - only if you want to exchange data at higher rate than 100mbit in total between the two groups it will, since you can transfer only 100mbit over one cable (if it's a 100mbit switch), so if you need more this is obviously a bottleneck.
| eamonn wrote: | | its weird because the speeds were nice but now they are bad. we have had no extra machines added or hardware changes to cause this slow down. |
Hardware can get defective. Software configuration can be lost due to updates. Wether it worked before or not does not matter, you have a problem right now and you need to investigate where it is located. As much as I'd like to help you more with that, these kind of problems really have to be solved on site. |
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File_Mangler
n00b
Joined: 06 Dec 2005
Posts: 2
Location: Colorado
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| Posted: Tue Dec 06, 2005 3:30 am Post subject: |
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| Any chance your switches are managed? If so, look for unusual stats on particular links like errors. Also a good way to look for bandwidth hogs that are running services you don't know about. |
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