Re: [Xen-devel] [PATCH] Reduce overhead in find_domain_by_id() [0/2]

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 6/12/06 1:35 am, "Santos, Jose Renato G" <joserenato.santos@xxxxxx>
wrote:

> 
> This is a set of patches to improve performance of find_domain_by_id().
> find_domain_by_id shows up high in profiles for network I/O intensive
> workloads.
> Most of the cost for this function comes from 3 main functions (of
> aproximate equal costs): 1)read_lock(), 2)read_unlock() and
> 3)get_domain().
> These patches replace the lock used for accessing domain_list and
> domain_hash with a lock free RCU scheme. Experiments confirm that the
> cost of find_domain_by_id() is in fact reduced by 2/3.
> The patches apply cleanly to changeset 12732.

Do you have numbers for performance improvement on a macro benchmark?

 -- Keir


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