Hi everyone,
I am getting extremely
inaccurate results from my setup:
- RedHat 8.0 on a Compaq
ProLiant 1600, dual PII/450, Intel Dual 100 NIC
- I’ve tried both SMP and
non-SMP kernels.
- I’m using the updated tc from
the HTB home page.
- I’m using the HTB that comes
with the RH8 kernel.
Here’s what’s happening. If I,
for instance:
tc
qdisc add dev eth2 root tbf rate 1.9mbit buffer 20Kb/8 limit
15Kb
Then my download rate goes at
360,000 bytes/s, which, by my calculations, is 2.77mbit. I am using Win2k
perfmon to test the speed. The line is flat and the speed is very consistent
(consistently *wrong*,
unfortunately…)
Immediately after, I
do:
tc
qdisc change dev eth2 root tbf rate 1.8mbit buffer 20Kb/8 limit
15Kb
My download speed is then
243,000 bytes/s, or 1.85mbit. Again, very flat, consistent
line.
I have played with the
parameters on both TBF and HTB in many different configurations. I always seem
to have a large jump between 1.8-1.9. I can’t find any number between those
two that will actually produce a 2mbit limit. I know 1.85 is close to 2.0, but
is this the expected margin of error? (Then again, 2.77 isn’t close to 1.9 at
all, so I hope not!)
Has anyone else experienced
anything like this?
Thank you very much for any help
you can provide!
Dan
Farino
Sr. System
Engineer
Stamps.com,
Inc.
Santa
Monica,
CA
