On Thu, Oct 17, 2013 at 05:02:59PM -0400, Mark J. wrote:
> Noticing that the write counter is not incrementing in the beancounter file, 
> nor is it allowing the cgroups to limit the writes either (guessing since the 
> counter isn't changing the cgroup isn't being applied since its not seeing a 
> change).
> 
> This is what I am setting for a test:
> 
> echo "9:1 10485760" > blkio.throttle.write_bps_device
> 
> md1 should be getting throttled to 10M/s but its not when running the 
> following in the vm:
> 
> dd if=/dev/zero of=/file bs=1024 count=10485760
> 5617418240 bytes (5.6 GB) copied, 81.7661 s, 68.7 MB/s

You are writing in page cache. What it a ram size on this host?

> 
> This on the other hand worked just fine to throttle the reads:
> 
> echo "9:1 10485760" > blkio.throttle.read_bps_device
> 
> dd if=/swapfile3 of=/dev/null
> 5617418240 bytes (5.6 GB) copied, 544.264 s, 10.3 MB/s
> 
> Anyone else having troubles getting the write counter to increment or 
> throttle?
> 
> vzctl: 4.5.1
> kernerl: 2.6.32-042stab081.5
> 
> I think I got everything this time. :p
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