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SubjectRe: tuning/turning off disc caching?
Kianusch Sayah Karadji wrote:
>
> Hi!
>
> Is there a way tuning (down) or turning off the disc caching in Linux for
> certain devices?
>
> What I do is writing data via dd or mkisofs directly to a DVD-RAM
> (/dev/srX). The kernel sees the DVD-RAM as a hard-disc. It works fine.
> The Problem is that during the write operation (which takes some time for
> 4,7GB data). The system slows down extremely and all the memory is used
> for caching.
>

There are no very good solutions to this at present. The following should
help:

- Drastically decrease the dirty memory thresholds in /proc/sys/vm/bdflush

- Make the writing application run fsync(fd) every few megabytes.

- Run /bin/sync once per second.
-
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