Re: FTP over PPP stalls out
2boxers_at_comcast_dot_net
Date: 11/16/03
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Date: Sun, 16 Nov 2003 03:15:06 -0500
Problem Solved !!!
I shut off the irqbalance service.
I adjusted the IRQ affinity for the serial port that the PPP modem was
connected to.
echo 2 > /proc/irq/4/smp_affinity
more about it here:
http://www.spoonix.com/howtos/smp_affinity.txt
When I did this, I immediately noticed a dramatic change for the
better.
By moving IRQ 4 to the second CPU, the performance was restored to
PPP.
I really dont know if it was IRQ contention or load on CPU 1, but even
with all the nics and controllers on CPU 2 with the serial port, the
performance increase was noticeable.
For good measure, I put everything but that serial port on CPU 1. Of
course individual processes can still interrupt either processor, but
it seems like it is fixed now.
RX errors are down to about 2% from 20%.
Downloads are up to 5.8 KB/sec from 1.5 KB/sec.
I notice in this configuration about 10% more CPU load to the second
processor and I take that as a good thing.
Additionally, something I didn't even have in my old configuration was
disabling MNP5 compression. This was a minor gain, but nevertheless
when we are talking kilobytes, I'll take what I can get.
Charles
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