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