Messages in this thread | | | Date | Fri, 27 May 2016 14:24:09 -0400 | From | Tejun Heo <> | Subject | Re: [BUG]Writeback Cgroup/Dirty Throttle: very small buffered write thoughput caused by writeback cgroup and dirty thottle |
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Hello,
Sorry about the delay. I forgot about this thread.
On Fri, May 13, 2016 at 02:11:53PM +0800, Miao Xie wrote: > Better than the kernel without patch. Now the benchmark could reach > the device bandwidth after 5-8 seconds. But at the beginning, it > was still very slow, and its thoughput was only 4MB/s for ~4 > seconds, then it could go up in 1~3 seconds.
I see. As this fix is needed anyways, I'll send it up. As for the ramp-up, it could be normal. There are estimators which take running avg and modulate the threshold accordingly and the starting values are conservative, so a short ramp-up time can be coming from that.
Thanks.
-- tejun
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