Re: dump time increase by 1h with new kernel

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "Justin T Pryzby" <justinp(at)norchemlab(dot)com>, <pgsql-performance(at)postgresql(dot)org>
Subject: Re: dump time increase by 1h with new kernel
Date: 2009-10-08 20:37:39
Message-ID: 4ACE0743020000250002B778@gw.wicourts.gov
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Justin T Pryzby <justinp(at)norchemlab(dot)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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