Re: performance with guests running 2.4 kernels (specifically RHEL3)

David S. Ahern
2008-05-14T20:35:53Z

Avi Kivity wrote:
> Not so fast... the patch updates the flood count to 5. Can you check
> if a lower value still works? Also, whether updating the flood count to
> 5 (without the rest of the patch) works?
>
> Unconditionally bumping the flood count to 5 will likely cause a
> performance regression on other guests.

I put the flood count back to 3, and the RHEL3 guest performance is even
better.

>
> While I was able to see excessive flooding, I couldn't reproduce your
> kscand problem. Running /bin/true always returned immediately for me.

A poor attempt at finding a simplistic, minimal re-create. The use case
I am investigating has over 500 processes/threads with a base memory
consumption around 1GB. I was finding it nearly impossible to have a
generic re-create of the problem for you to use in your investigations
on CentOS.

Thanks for the patch.

david

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