Messages in this thread | | | Date | Sun, 11 Sep 2011 07:08:29 +0200 | From | Greg KH <> | Subject | Re: RFC: [PATCH] Add a sysfs entry queue/ignore_flushes. |
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On Fri, Sep 09, 2011 at 04:34:05PM -0400, Anthony DeRobertis wrote: > I have an Oracle workload that ran quite fast under 2.6.32 due to mdraid > not supporting barriers. 2.6.33 slowed it down very substantially, and > its remains slow in 3.1. (Oracle is running on raw LVM logical volumes, > not filesystems, so ext4 barrier=0 doesn't help). > > This patch adds a sysfs attribute to allow flush/fua to to turned off > (ignored) on a per-block-device basis. I have tested it on both a VM and > real hardware. > > I'm not sure that queue_flags is the best place to put the bit, seems > like it may more logically go in flush_flags, but everything else is in > queue_flags. > > I'm not subscribed, but will be looking for replies via list archives. > Feel free to CC me.
If you add/remove/change sysfs attributes, you also need to do the same to Documentation/ABI.
thanks,
greg k-h
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