Re: Jumbo Frames : RHLinux , NetApp, Which NICs and Switches ?

Hemant,

Jumbo frames are (or were.. if that is changed in recent) normally not recommended for Linux and Itanium based clusters due to numerous bugs/patches at OS related issues. Performance gain usually dependent on how much data you are sharing between instances.

Jumbo frames normally do not make any impact in GES performance as GES messages are very small (typically 200 bytes?). However for 8k block size, having a 9k MTU certainly helps as we can ship the data block in one packet rather than sending it in 4 different packets.

Regarding performance gains, I have seen improvements upto 50% in few cases (Apps on RAC) and it is certainly a good thing to have. But they were on sun clusters and i do not have any direct experience in Linux. I am open for your experience :)

-Gopal

On 1/5/07, Hemant K Chitale <hkchital_at_singnet.com.sg> wrote:
>
> If you have successfully used Jumbo Frames for a Linux Oracle Database Server
> connecting to a NetApp Filer, could you reply to me with information such as :
> 1. What performance gain did you see switching to Jumbo Frames ?
> 2. What NIC , Switches and Drivers were used ? Whether you had problems
> getting them to work together ?
>

-- 
Best Regards,
K Gopalakrishnan
Co-Author: Oracle Wait Interface, Oracle Press 2004
http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/

Author: Oracle Database 10g RAC Handbook, Oracle Press 2006
http://www.amazon.com/gp/product/007146509X/
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