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Re: dump time increase by 1h with new kernel - Mailing list pgsql-performance

From Kevin Grittner
Subject Re: dump time increase by 1h with new kernel
Date
Msg-id 4ACE0743020000250002B778@gw.wicourts.gov
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In response to Re: dump time increase by 1h with new kernel  (Justin T Pryzby <justinp@norchemlab.com>)
Responses Re: dump time increase by 1h with new kernel  (Justin T Pryzby <justinp@norchemlab.com>)
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Justin T Pryzby <justinp@norchemlab.com> wrote:
> On Thu, Oct 08, 2009 at 10:49:37AM -0700, Joshua D. Drake wrote:
>> Did your scheduler change between the kernel versions?
> No, it's deadline for both.

How about write barriers?  I had a kernel upgrade which turned them on
for xfs, with unfortunate performance impacts.  The xfs docs
explicitly recommend disabling it if you have a battery backed cache
in your RAID controller.

-Kevin

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