Re: Xeon vs Opteron - tests and questions

The first graph certainly looks like a checkpointing issue.

On Wed, Nov 09, 2005 at 07:49:23PM +0100, Marcin Giedz wrote:
> Jim C. Nasby napisa??(a):
>
> >That link isn't working for me,
> >
>
> Uppssss sorry... now it should work OK.
>
> >but if you're seeing 'spikey'
> >performance I'd bet that you need to change the bg_writer settings to
> >make it more aggressive, especially if you're seeing performance drops
> >Every 5 minutes (assuming default checkpoint settings).
> >
> >
> >You might also want to up wal_buffers and maybe checkpoint_segments.
> >
> >
>
> OK many thanks, I will check.
>
>
> >On Wed, Nov 09, 2005 at 03:26:51PM +0100, Marcin Giedz wrote:
> >
> >
> >>Hello.
> >>
> >>
> >>I made some test comparing postgresql 8.0.4 based on two servers.
> >>
> >>Here is a link:
> >>http://85.128.68.44/
> >>
> >>
> >>From my point of view it seems like:
> >> - with opteron I found that it works very FAST periodicaly, why???
> >> Maybe I did something wrong or.....
> >> - xeon seems to work almost all time on the same level but has much
> >> less performance than opteron. Is it normal?
> >>
> >>Did anyone has similar tests/results?
> >>
> >>BR,
> >>Marcin
> >>
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> >>
> >>
> >>
> >
> >
> >
>
>
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--
Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com
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