Re: [BUG] bad performance and system stalls when using dm-crypt

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On 12.09.2010, dave b wrote: 

> Should I forward my 'bug' to the linux kernel maliing list ?

I'm not shure at all what causes the behaviour you encounter, there is 
the device-mapper, the crypto layer, the disk scheduler and a lot more
which could be more or less related. 

There was a similar monster thread some months ago on latency issues
(which was not crypto related!), Linus did a "yum update" in the
background while reading mail with Alpine and encountered some severe
stalls. A lot of work has been put into cfq afterwards, and latency is a
still ongoing issue in the Linux kernel and on the lkml (see the patch
from M. Desnoyers which came up today regarding sched granularity).

In a nutshell: I don't know :-)


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