Jian Qiu wrote:
Thanks again for the info.
As you suggested, I did test on the most recent 7.0-stable-200807 kernel.
The SMP throughout on the new kernel was improved to around 90MB/s.
However, SMP kernel still had no advantage over UP, at least for this
kind of single threaded applications.
I further did the same test on Linux with both SMP and UP.
I did observe the same trend.
The throughput on UP (~210MB/ecs) was also much better than SMP (~170MB/sec).
However, I was surprised again that the local UDP throughput on Linux
was more than double of FreeBSD.
Since all these tests were performed on the same machine, it must be
because of the kernel that made such big differences.
I'm curious what is the major performance bottleneck in FreeBSD network stack??
Is there any plan in community to address these issues?
In our application-level tests FreeBSD significantly out-performs Linux,
so either you have found a different workload, or something is not
configured equally. One important thing I can think of off the top of
my head is that Linux has a larger socket buffer size by default, so try
tuning that on FreeBSD or confirm they are equal.
If that still fails, can you provide test code?
Kris
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