about the improvment of network performance
Alex Satrapa
grail at goldweb.com.au
Fri Jan 18 17:27:52 EST 2002
On Friday, January 18, 2002, at 04:05 , Matthew Hawkins wrote:
> The real problem needs to be described a lot better. Maybe the system
> is underpowered cpu-wise, has a lot of ipchains rules, and throughput is
> becoming cpu-bound. Maybe the mss is set to 41 and all the tcp packets
> are transferring 1 byte. Maybe the remote end is really slow. Who
> knows?
Let's stick to the obvious questions first ;)
But yes, you're right about needing a more powerful machine to handle
lots of rules. But as an example, I have a Pentium 133 running my ADSL
connection, and when I'm downloading stuff from the office and chewing
up all the bandwidth, the machine is sometimes using 20% of available
processor time. I only have 20 rules in my ppp0-in chain, and 8 rules
in my ppp1-in chain. ppp1 is a PPTP link to another site (my office),
ppp0 is the PPPoE ADSL connection that ppp1 is using to talk to the
office.
I have no idea how much of the memory bandwidth is being used (can
anyone tell me how to find out - is there a tool like 'top' that will
measure FSB utilisation?), so I have no idea where any bottlenecks would
arise.
Alex
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