Re: speeding up ugen by an order of magnitude.

From: Poul-Henning Kamp <phk_at_phk.freebsd.dk>
Date: Thu, 08 Jul 2004 11:35:32 +0200
In message <20040708093145.GX12877_at_cicely12.cicely.de>, Bernd Walter writes:

>Can we do interleaving with physio?

physio is just a way to avoid copyin/copyout.  It maps & pins the
space the user indicated in read(2) or write(2) into the kernel
address space so that the kernel can access it directly.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk_at_FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
Received on Thu Jul 08 2004 - 07:35:44 UTC

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