Messages in this thread | | | Date | Sat, 23 Jul 2011 16:07:21 +0800 | From | Wu Fengguang <> | Subject | Re: [PATCH 3/9] writeback: bdi write bandwidth estimation |
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On Sat, Jul 02, 2011 at 03:29:15AM +0800, Vivek Goyal wrote: > On Wed, Jun 29, 2011 at 10:52:48PM +0800, Wu Fengguang wrote: > > The estimation value will start from 100MB/s and adapt to the real > > bandwidth in seconds. > > > > It tries to update the bandwidth only when disk is fully utilized. > > Any inactive period of more than one second will be skipped. > > Is this piece of code being tested in your graphs? Are there any > inactive periods which get filtered out in your workload? I am > assuming in a continuous dd, we will not have periods of inactivity > 1 second long.
There are no inactive periods in the dd tests. However I did try "watch cat /debug/bdi/8:0/stats" while starting some write workloads in background. When the write stops, the bandwidth does stop updating.
Thanks, Fengguang
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