[Cialug] Troubleshooting high latency/low speed
newz at bearfruit.org
Thu Jul 29 09:42:49 CDT 2010
On Mon, Jul 26, 2010 at 4:46 PM, Matthew Nuzum <newz at bearfruit.org> wrote:
> Hello, I've got a server and accessing it is slow lately (about a week
> now). Sometimes just slow, other times intolerably slow.
> Ping does not indicate too much prob. Latency is about 70-80ms which is
> fine. However SSH, HTTP and even HTTPS over a non-standard port all make it
> clear there is a problem. Can you suggest how to troubleshoot this?
With your help and also the help of some in our irc chat room (#cialug on
freenode) - thanks arreyder! I loaded up wireshark and found some possible
I sent an email to the service provider and as it turns out, it helped them
pin-down a trouble-maker on their network that was sending out loads of
They shut that server down and the problem went away, almost as if by magic.
The funny thing is that I only experienced this problem on one of the four
servers I have there. I loaded tcpdump on one of the others and while I
found some broadcast traffic it was nothing comparatively. (this one host
was generating 2.4Mb/s pretty constantly according to iftop)
Of the four servers, 3 are dells, one running debian/xen, the other two
Ubuntu 8.04, and the fourth one, the one with this prob, is a Super Micro
running Ubuntu 8.04 w/ a debian/xen kernel.
Oh well, glad it's fixed now.
newz2000 on freenode, skype, linkedin, identi.ca and twitter
"Never stop learning" –Robert Nuzum (My dad)
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