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Hi list! |
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Whenever I do sequential IO for a long stretch of time (e.g. md5summing |
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40 GB), I'm experiencing high load (ca. 6 on a 4 CPU system) and |
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temporary freezes of most applications. For example, switching between |
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tabs in konsole sometimes takes more than 2 seconds. |
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When doing this on an ext4 filesystem, the load seems to result from |
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khugepaged and kswapd0 as well as some kworkers. |
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I think I've had similar issues with NFS over wifi but I cannot test |
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this now. |
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Today I copied 60GB from my hard disk to an USB disk formatted with |
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NTFS, issuing the copy command from KDE's dolphin. The freezes became so |
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long it was impossible to work and then X11 locked up and had to be killed. |
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I tried using a preemptive kernel but that didn't seem to help. blkio |
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and cpu cgroups didn't help either. Ionice seems to be the only solution |
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but while I'm okay with that, my dad won't be. Can anyone tell me what |
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is causing this behavior? |
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Throughput is good, by the way. That's why I don't suspect a driver issue. |
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Thanks in advance! |
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Florian Philipp |
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