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Re: wm(4) performance issues

On Sat, Mar 08, 2008 at 09:03:46AM -0600, Jonathan A. Kollasch wrote:
> On Sat, Mar 08, 2008 at 09:07:20AM -0500, Thor Lancelot Simon wrote:
> > 
> > This is a single-stream test?  What are your send and receive socket buffer
> > sizes at each end?
> Single stream I believe.  Defaults.

To be blunt, running a single-stream TCP test on a gigabit network with
32 kilobyte socket buffers is a considerable waste of time; tuning based
on the results of the same a prodigious one.

You'll get more performance from your system with far less effort by
adjusting the default socket buffer sizes with sysctl (or turning on
automatic socket buffer sizing) than by turning down interrupt latency
in device drivers until your kernel is doing little else...


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