Unless you have actual "shielded" catX with a foil wrapping inside, 
and/or separation of the 4 pairs individually (cat6e/cat7), don't assume 
it's shielded from microwaves and fluorescent ballasts.  Higher the cat, 
the better/faster modulation they support for data transmissions 
(100m/1g/10g/40g).  Cat5e is just fine for gig, most cases (good crimp, 
sheathing inside the head, good cable with no tears/kinks) so is cat5.

With NFS as Ben said, those options help significantly too.  I mount my 
nfs volumes with "rsize=32768,wsize=32768,noatime", and noatime on your 
disks in general typically helps quite a bit.

Otherwise, you just have to dig into sysctl's and "performance tuning 
linux" docs readily available.

-mb


On 02/19/2012 07:12 AM, Stephen wrote:
> n't shield the line s well as 5e or 6 does. So there is degredatio
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