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Re: (u)dma not activated, slow disc access

To: misc_(_at_)_openbsd_(_dot_)_org
Subject: Re: (u)dma not activated, slow disc access
From: Henning Brauer <lists-openbsd_(_at_)_bsws_(_dot_)_de>
Date: Sun, 14 Dec 2003 18:45:36 +0100
Cc: bumby_(_at_)_bumby_(_dot_)_net
Mail-followup-to: misc_(_at_)_openbsd_(_dot_)_org, bumby_(_at_)_bumby_(_dot_)_net

On Sun, Dec 14, 2003 at 05:57:01PM +0100, Martin Stenberg wrote:
> bumby_(_at_)_sunni:~$time cp 200mb_data bla

this is not a valid benchmark.
you're testing caching and how careless (async...) you mounted 
partitions on your linux system, nothing else.

> wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 5

how you come to the idea that DMA is not enabled is beyond me...

-- 
http://2suck.net/hhwl.html - http://www.bsws.de/
Unix is very simple, but it takes a genius to understand the simplicity.
(Dennis Ritchie)

References:
- (u)dma not activated, slow disc access
  - From: Martin Stenberg

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