Good to know. I've got a few spare machines I might be able to test 3.2 kernels on in the next few months On Thu, Jun 20, 2013 at 12:54 PM, Shaun Thomas <sthomas@xxxxxxxxxxxxxxxx> wrote: > On 06/17/2013 04:00 PM, Joshua D. Drake wrote: > >>> >>> http://postgresql.1045698.n5.nabble.com/Ubuntu-12-04-3-2-Kernel-Bad-for-PostgreSQL-Performance-td5735284.html >>> >>> tl;dr for that thread seems to be a driver problem (fusionIO?), I'm >>> unsure if Ubuntu specific or in the upstream kernel. > > > That instance wasn't a driver problem. The problem was that the FusionIO > driver uses kernel threads to perform IO, and it seems that several of the > 3.x kernels have issues with task migration using the new CFS CPU scheduler > which replaced the O(1) one. > > The next thread related to this that fixed our particular case was this one: > > http://www.postgresql.org/message-id/50E4AAB1.9040902@xxxxxxxxxxxxxxxx > > -- > Shaun Thomas > OptionsHouse | 141 W. Jackson Blvd. | Suite 500 | Chicago IL, 60604 > 312-676-8870 > sthomas@xxxxxxxxxxxxxxxx > > ______________________________________________ > > See http://www.peak6.com/email_disclaimer/ for terms and conditions related > to this email -- To understand recursion, one must first understand recursion. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
