On Sun, Aug 07, 2011 at 11:39:33AM -0700, Dhaval Giani wrote:
> [Adding vgoyal to the cc]

[..]
> > ------ process 31646 ------
> >
> > user@localhost$ dd if=/tmp/fourgigfile of=/mnt/fourgigfile bs=4k 
> > count=1000000
> > 1000000+0 records in
> > 1000000+0 records out
> > 4096000000 bytes (4.1 GB) copied, 58.6709 s, 69.8 MB/s

Currently blkio throttle does not control the buffered writes. So try
above commnad with oflag=direct and it should help.

Thanks
Vivek

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