DragonFly kernel List (threaded) for 2004-04
Re: Strange NFS performance
At Tue, 20 Apr 2004 13:36:44 -0400,
Dave Cuthbert wrote:
> Have you been able to rule out hardware problems?
> I'm thinking specifically of the cabling -- I've encountered far too
> many questionable CAT-5 cables which have either been improperly
> constructed (e.g., 3&4/5&6 paired instead of 3&6/4&5) or had one too
> many chairs roll over them. Far less commonly, our switches in the
> office also have a tendency to lose a port or forget their duplex
> settings at times.
I'm too little of a network person to really be sure that there isn't
any hw problems. However, when I run fbsd 5.2 instead of dragonfly on
Comp3 the network performance is really good in both directions, even
in both directions simultaneously. So I think there is some problem in
Trying to send as much data as possible in both directions using netcat
and tcp with dragonfly on Comp3 shows performance like this
[bsd//rnyberg]$ netstat 1
input (Total) output
packets errs bytes packets errs bytes colls
18 0 17116 21 0 17770 0
When running fbsd 5.2 on Comp3 the values are >12000000 instead of >17000
in both input and output columns.
If it was a hw problem, shouldn't that affect fbsd as well?
Anyway, since these are extreme cases, it is not a huge problem for me.
I was just curious about the strange performance.