On Fri, Jul 25, 2008 at 06:12:55PM +0000, The Fungi wrote:
> On Fri, Jul 25, 2008 at 06:54:19PM +0200, Emilio Ancillotti wrote:
> > This is a snapshot of the CPU utilization obtained with the top command:
> >
> > Cpu(s): 4.2%us, 27.8%sy, 0.0%ni, 0.0%id, 0.0%wa, 15.2%hi, 52.8%si,
> > 0.0%st
> >
> > I don't use any sort of security during my tests
>
> Okay... I thought you might be bottlenecked with the CPU trying to
> handle an increased number of crypto calculations, but that doesn't
> seem to be the case.
Actually, I misread your top output. During your testing, according
to this snapshot...
4.2%us: The time the CPU has spent running users’ processes that are
not niced.
27.8%sy: The time the CPU has spent running the kernel and its
processes.
15.2%hi: The amount of time the CPU has been servicing hardware
interrupts.
52.8%si: The amount of time the CPU has been servicing software
interrupts.
4.2 + 27.8 + 15.2 + 52.8 = 100.0
This agrees with the 0.0%id reported. So you definitely have a CPU
bottleneck there. Whether it is a symptom or the cause is hard to
say without more information, but 40% of two 50+ Mbps wireless links
doesn't sound too out of line with reported throughput limitations
of the 4801 product line, as reported in previous threads on this
mailing list (if I read you correctly).
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