lkml.org 
[lkml]   [2003]   [Jan]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [BUG] BUG_ON in I/O scheduler, bugme # 288
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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:32    [W:0.106 / U:0.812 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site