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On Dienstag, 17. April 2007, Matthias Fechner wrote: |
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> Hello Volker, |
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> |
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> * Hemmann, Volker Armin <volker.armin.hemmann@××××××××××××.de> [17-04-07 |
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10:11]: |
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> > which is correct. You don't set dma for SATA devices and you don't do it |
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> > with hdparm. |
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> |
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> ah ok, thx for that information. |
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> But I have a problem. If I copy some data on disks the system is at a |
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> very high load and extremely slow (load at 2.5). |
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> |
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> If I record movies with VDR every recording is damaged (distortions). |
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> |
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> So I thought it is a problem of missing DMA. |
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> |
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> Is the SATA driver so bad and produces a such high CPU load? |
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Dunno, I am recording fine and sata is fast (uli based board, jmicron |
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controller). There is a lot of stuff that can go wrong. IO-scheduler (which |
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one are you using), preemption (don't use forced preemption), ticks... |
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The lower the latency, the lower the troughput, for example.... |
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-- |
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