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Hi list, |
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|
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I need a pointer, please. Something is amiss on my laptop’s setup. When I |
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copy a number of big files (i.e. videos) from one USB device to another, it |
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starts to read the file, then after a few seconds starts to write to the |
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destination and only *after* that file has been completely written, it |
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continues with the next file. |
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|
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I never knew this behaviour before and my PC does not do this -- it copies |
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in one continuous go. |
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|
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I noticed it first in KDE’s transfer speed graph. Then I could reproduce it |
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with a simple `cp`, but also with rsync and mc. It must be a kernel setting |
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regarding power saving or writeback size or what have you. |
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|
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Can you give me a nudge? My sysctl.conf has only one active line besides |
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some netfilter stuff: |
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vm.swappiness = 1 |
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(This is an SSD, I don’t even have swap on this machine unless I know I |
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definitely need it temporarily) |
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|
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|
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Here is the output of dstat whilst I copied a number of videos from a USB stick |
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to an external USB 2 harddrive in mc: |
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|
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----system---- ----total-cpu-usage---- -dsk/total- ----most-expensive---- |
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time |usr sys idl wai hiq siq| read writ| block i/o process |
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12-01 20:00:49| 1 1 73 25 0 0| 0 34M| |
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12-01 20:00:51| 1 1 73 25 0 0| 0 37M| |
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12-01 20:00:53| 3 2 72 22 0 0| 20M 20M|mc 20M 20M |
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12-01 20:00:55| 5 3 71 21 0 0| 34M 0 |mc 34M 34M |
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12-01 20:00:57| 5 4 70 21 0 0| 33M 812k|mc 33M 33M |
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12-01 20:00:59| 1 1 73 25 0 0| 0 36M| |
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12-01 20:01:01| 1 1 73 25 0 0| 0 34M| |
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12-01 20:01:03| 3 2 73 22 0 0| 25M 17M|mc 25M 25M |
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12-01 20:01:05| 4 2 73 21 0 0| 34M 0 |mc 34M 34M |
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12-01 20:01:07| 4 3 73 21 0 0| 34M 0 |mc 34M 34M |
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12-01 20:01:09| 2 2 73 23 0 0| 12M 29M|mc 12M 12M |
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12-01 20:01:11| 2 1 64 34 0 0|4096B 34M| |
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12-01 20:01:13| 1 1 49 49 0 0| 0 34M| |
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12-01 20:01:15| 4 2 71 23 0 0| 31M 9381k|mc 32M 32M |
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12-01 20:01:17| 4 2 73 21 0 0| 34M 17k|mc 34M 34M |
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12-01 20:01:19| 3 3 73 21 0 0| 34M 3132k|mc 35M 35M |
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12-01 20:01:20| 3 3 68 26 0 0| 35M 34M|mc 35M 35M |
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|
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Cheers |
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|
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-- |
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Gruß | Greetings | Qapla’ |
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Please do not share anything from, with or about me with any social network. |
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|
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Nothing is illegal if one hundred business men decide to do it. |