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On 06/11/2014 01:41 PM, Stefan G. Weichinger wrote: |
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> Am 11.06.2014 13:52, schrieb thegeezer: |
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> |
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>> ok baffling. |
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>> sdc i already said would be slower but not this much slower |
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>> it certainly should not be slower than the lvm that sits on top of it! |
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>> i can't see anything in the cgroups that stands out, maybe someone else |
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>> can give a better voice to this. |
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>> |
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>> all i can think is there is other IO happening |
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>> in atop if you can highlight any line that begins LVM CPU or DSK and |
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>> paste it in to a reply - with no virtualmachines running and no dd or |
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>> anything. |
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>> then run a dd as before and highlight the lines in atop while it is |
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>> running (maybe increase count to 1000 to give yourself a chance) and |
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>> paste in here too |
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> |
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> I did a test with a sysresccd from 2013 (that is kernel 3.4.52 ... phew) |
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> |
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> Just booted, "vgchange -ay" and then the dd-test from LV to /dev/null |
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> |
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> -> with or without count=500 I get around 340-350 MB/s ! |
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> |
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> So my kernel-config seems buggy or I should downgrade to something older? |
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I suspect that in your fully running system somethingelse(tm) is |
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stealing the activity. can you start up with no services enabled and |
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do the test ? |
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> Aside from that I checked the firmware of the controller, it has the |
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> latest release. |
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> |
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> Stefan |
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> |
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