Messages in this thread | | | Date | Fri, 24 Jan 2003 12:38:21 +1100 | From | Nick Piggin <> | Subject | Re: [BUG] BUG_ON in I/O scheduler, bugme # 288 |
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Dave Olien wrote:
>Jens, Andrew > >The group here doing dbt2 workload measurements have hit a couple of >problems APPARENTLY in the block I/O scheduler when doing write-intensive >raw disk I/O through a DAC960 extremeraid 2000 controller. > This wasn't a problem in 2.5.49. It has appeared since then. > >I've filed a bug on the OSDL bugme database. You can read it at: > > http://bugme.osdl.org/show_bug.cgi?id=288 > >I've also put a more complete report in my web site: > > http://www.osdl.org/archive/dmo/deadline_bugon. > >Begin with the README file. > >For same reason, the README file isn't appearing on my web page. >I'll look into that. In the mean time, I've included the contests >of the README file below. > >I'm about to try reproducing the problem on a smaller hardware >configuration. Then, I'll test whether the same problem occurs with >read intensive I/O. > Thanks for the report. Andrew, I think this may be because deadline_add_drq_rb puts "aliased" requests in the next_drq although they are not put on the sort or fifo lists. This is the problem I described to you before and exists in mm4.
Nick
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