On Wed, Apr 9, 2014 at 9:02 AM, Christofer C. Bell <christofer.c.bell@xxxxxxxxx> wrote: > On Thu, Apr 3, 2014 at 11:03 PM, François Beausoleil > <francois@xxxxxxxxxxx> wrote: >> Hi all! >> >> Does PG perform that much better on FreeBSD? I have some performance issues on a Ubuntu 12.04 which I'd like to resolve. iowait varies a lot, between 5 and 50%. Does FreeBSD better schedule I/O, which could alleviate some of the issues, or not at all? I have no experience administering FreeBSD, but I'm willing to learn if I'll get some performance enhancements out of the switch. >> >> $ uname -a >> Linux munn.ca.seevibes.com 3.2.0-58-generic #88-Ubuntu SMP Tue Dec 3 17:37:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux > > From the research I've done online, this is likely your issue. Kernel > 3.2.0 has some issues that directly and severely impact I/O wait times > for PostgreSQL. The suggested fixes (that seem to have worked for > most people reporting in) are to revert the OS to Ubuntu Server 10.04 > or to install one of the HWE (HardWare Enablement) kernels into the > 12.04 system (this would be one of the kernels from a later release of > Ubuntu provided in the 12.04 repositories). 12.04 supports 3.8.0 directly. There's a site on putting 3.10.17 or so on it as well I found by googling for it. You need 3.10+ if you wanna play with bcache which is how I found it. But you don't need to jump through any hoops to get 3.8.0 on 12.04.4 LTS -- 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
