Poor (ata-?)performance with VIA-based chipsets

Stefan 'Steve' Tell stefan.tell at crashmail.de
Sun Nov 18 02:04:46 PST 2007


I have a really bad performance with my FreeBSD system for years. After
long discussions[1] at the german BSD-community we figured out that it
seems to be a VIA-chipset based problem.

# dd bs=1m < /dev/random > /dev/null
does not slow down the system

but with

# dd bs=1m < /dev/zero > tmpfile
the system becomes nearly unusable after some seconds. If I start
mplayer to watch TV with my bt848-card the desktop environment freezes
for round about 10 seconds before switching a windows or something like

Any ideas how to fix this?

[1] = http://www.bsdforen.de/showthread.php?t=19426&highlight=performance
(german language)

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