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Re: [suse-oracle] Bad performance on Proliant DL580 G4

Herman Maseberg

2007-05-30

Replies:

"Igor Ushkalo" <igorus@(protected):

> Hi, people!
> Just my 5 cents...
>
> >> Why did you expected better performance on 64 bit servers?
> >> It is not true;
> > Because RAM memory es almost double and then I can
> > address more SGA increasing cache hit ratios.
> If you already have hit ratio near 100% you could use
> even 4-times more RAM/buffer cache but hit ratio
> will be near the same (it couldn't be more then 100%).
> But you will loose in latch contention and performance
> will degrade... That's only example.
Agree with you, in my case cache hit ratio is 95%, I can´t avoid some long
reports because are standard transactions from SAP and are inefficient
because involve large tables with merge joins.
In the old box this cache was 90%.

> Agreed with Alexey - you should perform extended
> Capacity Planing to know what you'll get exactly.

I'm performing some tests with a lab server following recomendations from
Juan Miranda from this mail list to improve I/O performance changing boot
parameters (elevator=deadline) and using async I/O.

Thanks!

Herman


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