Messages in this thread |  | | | Date | Tue, 21 Jun 2005 18:41:21 -0700 | | From | William Lee Irwin III <> | | Subject | Re: 2.6.12-mm1 & 2K lun testing (JFS problem ?) |
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On Tue, Jun 21, 2005 at 05:34:54PM -0700, Badari Pulavarty wrote: > Hi Andrew & Shaggy, > Here is the summary of 2K lun testing on 2.6.12-mm1. > When I tune dirty ratios and CFQ queue depths, things > seems to be running fine. > echo 20 > /proc/sys/vm/dirty_ratio > echo 20 > /proc/sys/vm/overcommit_ratio > echo 4 > /sys/block/<device>/queue/nr_requests > But, I am running into JFS problem. I can't kill my > "dd" process. They all get stuck in: > (I am going to try ext3).
If you could get unabridged profiling data for raw vs. fs (so it can be properly sorted) I would be interested in that. Early indications were large amounts of time spent in shrink_zone(), obtained by re-sorting the truncated profile listings. It indicated the time spent in shrink_zone() was 26.3 times as much time spent in default_idle(). Typically copying to and from userspace are enormous overheads, but aren't observable in the truncated/mis-sorted profiles, which calls them into question, barring unreported usage of O_DIRECT. There are also no totals reported, which are helpful for interpreting realtime behavior.
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