Re: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5 on AMD chipsets - bisected

Mike Galbraith
2012-09-24T15:51:16Z

On Mon, 2012-09-24 at 17:30 +0200, Peter Zijlstra wrote:

> Anyway, does anybody have any clue as to why AMD and Intel machine
> behave significantly different here? Does an Intel box with HT disabled
> behave similar to AMD? or is it something about the micro-architecture?

If you mean pgbench, it should act about the same on both. As soon as
pgbench starts using significant CPU and has to compete, it'll start
having trouble.

-Mike