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Date:      Sat, 23 Sep 2006 21:53:18 -0500
From:      Paul Schmehl <pauls@utdallas.edu>
To:        questions@freebsd.org
Subject:   Device polling - worthwhile?
Message-ID:  <188DD322AA361E26DFC311B9@paul-schmehls-powerbook59.local>

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I've been reading about device polling.  I'm wondering if it's worth doing =

on a busy website (4,000,000+ hits/month, 45GB+ bandwidth use).  I=20
understand what polling is and how it queues traffic as opposed to the=20
"old-fashioned" interrupt method, but do you really gain performance-wise? =

Are there any pitfalls to enabling it in the kernel?  (I understand you=20
can enable/disable it using ifconfig.)  Any gotchas regarding tuning?=20
(This is a production website.  I don't want to cause problems that are=20
hard to figure out.)

If it matters, I'm running 6.1 RELEASE, GENERIC kernel, Broadcomm GIG=20
NICs, 3.2GHz processor, 2GB of memory, apache 1.3.*

Paul Schmehl (pauls@utdallas.edu)
Adjunct Information Security Officer
The University of Texas at Dallas
http://www.utdallas.edu/ir/security/

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