Messages in this thread | | | Date | Mon, 31 Oct 2011 16:33:13 +0800 | From | Wu Fengguang <> | Subject | Re: linux 3.1 issue: bdi dirty threshold goes mad |
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On Fri, Oct 28, 2011 at 06:58:22AM +0800, Wu Fengguang wrote: > Hi, > > FYI, I find bdi dirty threshold madness in the newly released v3.1 > according to the gray lines in the attached graphs, which are for > these test cases: > > 3G-UKEY-HDD/ext4-1dd-4k-8p-2948M-20:10-3.1.0-vanilla+ > 3G-UKEY-HDD/xfs-10dd-4k-8p-2948M-20:10-3.1.0-vanilla+ > 3G-UKEY-HDD/xfs-1dd-4k-8p-2948M-20:10-3.1.0-vanilla+ > > It's basically doing concurrent dd's to a USB key and a hard disk. > > Don't know what's going wrong, but at least should be bisectable..
It seems to depend on kernel builds: the problem disappears in the newly compiled kernels. This makes it pretty hard to catch the root cause...
Thanks, Fengguang
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