On Sun, 09 Sep 2001 22:14:24 -0400 Ian Marchak <[EMAIL PROTECTED]> wrote:
> Tim Wunder wrote:
> >
> > I spent much of this afternoon enabling NFS
---snip---
> > Any recommendations on troubleshooting network performance?
>
> If you are running a 10Mb 4 port hub, you'll probably never get more
> than 2.5 megabits of xfer no matter what you do. A hub divides the
> total bandwidth (10Mb/s in your case) between all the ports evenly.
>
Not to mention that only one port is active at a time...
> A 10Mb/s switch on the other hand allocates 10Mb/s **per port**.
>
And can have all ports active simutaneously. Some will even do duplex I/O very
nicely. The really nice thing about switching features... if you plug-in a
really bad
connection into it, one that barely does any I/O at all... the switch box will
still run
all the other connections at full speed reguardless. A hub will down shift it
all...
I've been in more than one installation where everything is 100mb, save for a
forgotten 10mb client somewhere and... low and behold that shiney new 100mb hub
insists on running everthing at 10mb... A switch box won't do that... it'll run
everything
at peak speed, whether it's 10 or a 100...
I've got Linksys hubs with switch features that are doing duplex 100mb I/O...
> As for your download speeds, are you certain you are getting 30Mb/s?
> That's actually honkin' fast for a home connection of any type. @home
> limits you to 3 Mb/s, your son I suspect was getting xfer rates in the
> hundreds of Kb/s range. It almost sounds normal to me...a 10 Mb hub
> will not win many speed contests...except ones against a sneaker-net.
>
I'm on comcast@home and see download speeds in the 400 to 600k range at times.
The connection from the cable mode is 10mb... and it still flies like the wind
sometimes.
It depends a great deal on the load of the servers your packets are streaming
through or at the least on the server you're connected to. I once ftp'ed the
workstation
3.1 iso in under an hour. That, was heavenly... :')
> I suspect that .wav performance would be quite choppy, due to the fact
> that you are trying to stream/play files that have file sizes best
> estimated in ten's of megs...quite a challenge for a 2.5 Mb/s pipe.
>
One thing that could be done for the choppy problem, increase the cache size on
the
media player and set it up to cache a large percentage of the file before
playing it...
I'm assuming XMMS, ofcourse.
> You can check your for collisions during a big transfer though, they
> will bring hubs to a near standstill without much effort. Another thing
> to suggest would be cable swapping, unless you are quite sure you have
> good cables, they can cause trouble quite easily...were they bought or
> built?
>
Amen to to that one! Don't be cheap... buy only cat 5e cables. One day 1000mb
will
be cheap enough for the average user and having cat 5e already installed will
make
the upgrade easier...
The bottom line here is, sell the hub to a neighbor and buy a hub with switch
box
features... one that will support both 10mb and 100mb would be prefered.
Supporting
1000mb would be really prefered... ;')
One other thing you can try... twiddle the nfs parameters in fstab like this:
spyro:/ /sroot nfs rsize=8192,wsize=8192,hard,intr,noauto 0 0
The send and recieve buffers can be made quite large with 8k seeming to be
about
right for everyone... :')
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