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Subject: Re: PLIP driver in 2.2.xx kernels
To: lnxkrnl@mail.ludost.net
Date: Sat, 28 Oct 2000 15:30:07 +0100 (BST)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <Pine.LNX.4.10.10010281859580.3112-100000@doom.izba.net> from "lnxkrnl@mail.ludost.net" at Oct 28, 2000 07:04:12 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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>   I have a question - Why does the PLIP driver does consume so much CPU ?
> I tried it today, and when i did ping -s 16000 dst_ip, the kernel consumed
> about 50% of the CPU time ( /proc/cpuinfo and /proc/interrupts follow).
> Any ideas ?

It has to bang on the parallel port controller the hard way, there is no
useful hardware support on a basic parallel port for the kind of abuse needed
for PLIP
-
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