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Re: Strange behavior: pgbench and new Linux kernels
- From: "Jeffrey Baker" <jwbaker(at)gmail(dot)com>
- To: "Greg Smith" <gsmith(at)gregsmith(dot)com>
- Cc: pgsql-performance(at)postgresql(dot)org
- Subject: Re: Strange behavior: pgbench and new Linux kernels
- Date: Thu, 17 Apr 2008 10:09:09 -0700
- Message-id: <fd145f7d0804171009h7658d3bbqf099b5c0e9235268(at)mail(dot)gmail(dot)com>
On Thu, Apr 17, 2008 at 12:58 AM, Greg Smith <gsmith(at)gregsmith(dot)com> wrote: > So in the case of this simple benchmark, I see an enormous performance > regression from the newest Linux kernel compared to a much older one. This has been discussed recently on linux-kernel. It's definitely a regression. Instead of getting a nice, flat overload behavior when the # of busy threads exceeds the number of CPUs, you get the declining performance you noted. Poor PostgreSQL scaling on Linux 2.6.25-rc5 (vs 2.6.22) http://marc.info/?l=linux-kernel&m=120521826111587&w=2 -jwb
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